A short story about an unkown man, 1st chapter (HELP me with my grammar and spelling, PLEASE)

Charlie was, as always, heading home. He was determined to change his life this time. He promised himself that this would be the last time waking up in an disgusting alley, surrounded by trash, rats and stray dogs looking for the leftovers of a cheap restaurant. Hencehold, he should put himself togheter and start thinking as the father he just became.

He was now strolling across a broad avenue, one of the main roads that fed the decadent city, once full of life and joy. He thought about it. "Once, this street was well-paved, crowded, warm and busy, like a main blood vessel carrying oxigen to the cells", he thought. "Now I can't even walk over it because of the potholes and puddles".

He continued wandering, thinking about the last diagnosis he had made just a month ago. He had saved that kid in the last moment, but he hadn't been able to save his mother. He was inmersed in his memories, the ones that were leading him into a dark and painful life. But he quickly realised something. The atmosphere whas different this time in the street. Something weird was going on, but Chalie couldn't guess what was happening. The air was carrying an odd scent, which remembered him to the roast chicken that his mother would cook in his chidlhood. Suddenly, he realised that there isn't anybody in the street. Traffic lights were still working, but there were no cars abiding their luminous orders. He frowned, but he had no time to think.
He heard a humongous noise at the end of the street. An entire building gave way before he could move. The dust, expanding everywhere, filled the air while Charly was looking for a shelter. He found an entrance hall, big enough to keep him safe. He tried to open the door but it was locked, so he broke the glass and unlocked it. He started running along the main aisle and turned left.

Something hit him. He floped, and before he pass away, he saw a blurry shoe and heard "we got him!".

To be continued...

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As usual (1), Charlie was heading home. He was determined to change his life this time. He promised himself that this would be the last time he woke in a disgusting alley, surrounded by trash, rats and stray dogs looking for the leftovers of a cheap restaurant. Starting today he would get it together and start acting like an adult, like the father he had just become. 

He strolled (2) across a broad avenue, one of the main roads that fed the decadent city, once full of life and joy.(3) He thought  about it, "Once, this street was well-paved, crowded, warm and busy, like a main blood vessel carrying oxygen to the cells", he thought. "Now I can't even walk over it because of the potholes and puddles".

He continued wandering, thinking about the last diagnosis he had made just a month ago. He had saved that kid in the last moment, but he hadn't been able to save his mother. He was inmersed in his memories, the ones that were leading him into a dark and painful life. But he quickly realised something. The atmosphere whas different this time in the street.

Something weird was going on, but Chalie couldn't guess what was happening. The air was carrying an odd scent, which remembered him to reminded him of the roast chicken that his mother would cook in his chidlhood. Suddenly, he realised that there isn't wasn't anybody in the street. Traffic lights were still working, but there were no cars abiding their luminous orders. He frowned, but he had no time to think.

He heard a humongous noise at the end of the street. An entire building gave way before he could move. The dust, expanding billowing everywhere, filled the air while Charly was looking looked for a shelter.

He found an entrance hall, big enough to keep him safe. He tried to open the door but it was locked, so he broke the glass and unlocked it. He started running along the main aisle hallway and turned left.

Something hit him. He floped huh? fell, and before he pass away, passed out,  he saw a blurry shoe and heard "we got him!".

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(1) Your grammar and spelling are good, but you have chosen the wrong word.  Charlie cannot always be heading home: is someone moving his house, so that he never arrives and is always heading home ? I think you mean to tell your reader that waking in an ally is something that happens regularly to Charlie. 

(2)  Stroll is a great verb, and I am impressed that you know it.  But does it really fit ?  Did Charlie stroll after he woke from a drunken stupor in an alley ?  Might not Charlie stumble, crawl, drag, limp, shuffle ... or any other verb that connotes difficulty.  Alternatively, might Charlie march -- connoting his new resolve to live right ? 

(3)  This is called a dangling participle.  It's not good, but common to MANY English writers. Do you mean the decadent city, the road, or Charlie himself was once full of life and joy. It's plain that you can write, so think about it. Many ways to fix this. 

(4)  This metaphor/simile has me lost, but grammatically, it's correct. I understand that you want to show Charlie is a physician, because he thinks about things in anatomical terms... but....  Gotta say though, ten points for ambitious writing.   

(5)   You write well, and your grammar is generally very good . The issue you seem to have is picking the right word, which is a very, very advanced skill.  Congrats. 

A short story about an unknown man, 1st chapter (HELP me with my grammar and spelling, PLEASE)

Charlie was, as always, heading home. He was determined to change his life this time. He promised himself that this would be the last time waking he woke up in an disgusting alley, surrounded by trash, rats and stray dogs looking for the leftovers of a cheap restaurant. Henceforth, he would pull himself together and start thinking(behaving might be better here) as like the father he had just become.

He was now strolling across a broad avenue, one of the main roads that fed(not the right word, maybe you mean led into, crossed) the decadent city, once full of life and joy. He thought about it. "Once, this street was well-paved, crowded, warm and busy, like an artery main blood vessel carrying oxygen to the cells", he thought. "Now I can't even walk over it because of the potholes and puddles".

He continued wandering, thinking about the last diagnosis he had made just a month ago. He had saved that kid at the last moment, but he hadn't been able to save his mother. He was immersed in his memories, the ones that were leading him into a dark and painful life. But he quickly realised something. The atmosphere in the street was different this time in the street. Something weird was going on, but Charlie couldn't guess what was happening. The air was carrying carried an odd scent, which reminded him to of the roast chicken that his mother would cook in his chidlhood. Suddenly, he realised that there wasn't anybody in the street. Traffic lights were still working, but there were no cars abiding to obey their luminous orders. He frowned, but he had no time to think.
He heard an humongous earth-shattering noise at the end of the street. An entire building gave way before he could move. The dust, expanding everywhere, filled the air while Charlie was looking for a shelter. He found an entrance hall entryway/doorway, big enough to keep him safe. He tried to open the door but it was locked, so he broke the glass and unlocked it. He started running along the main aisle corridor and turned left.

Something hit him. He dropped to the floor, and before he passed away(did he die, or just lose consciousness? "Passed away" means died, "passed out" means lost consciousness), he saw a blurry shoe and heard, "We got him!" 

To be continued...

A short story about an unkown man, 1st chapter (HELP me with my grammar and spelling, PLEASE)

When writing stories, the most important thing is to make the reader feel what you wrote.  In another words, able to convey emotion clearly and effectively.  Words must be simple, effective and straight to the point, ie no complicated long sentences in the description.  Use complicated words only when the situation warrants.  Corrected is not only grammar, spelling and the cosmetics of the language but suggestions on how to write and make the story more colorful.

Charlie was, as always, heading home. [Since you are using "as always", give us something to indicate what he was doing is routine, for example, "... heading home from his work". He had been thinking... And now had was determined to change his life this time. He had promised himself that this would will [this is more assertive]be the last time waking up in an disgusting alley; surrounded by the smell and sight of trash, rats and strays dogs looking scavenging for the leftovers of a dumped out by some cheap restaurant. Henceholdhenceforth, [Too formal] Never again!  He  should will and must put himself toghether and start thinking as the behaving like a father whom he had just become. [Good introduction and scene set up]

He was now strolling across a broad avenue, one of the main roads arteries [since you are using a biological comparison.  This serves as the introduction to later description] that feeds the decadent city heart., Once [or even "Once upon a time"] the place/it/full was filled with of life and delight joy.

He thought about it. "Once, This street was once well-paved, crowded, warm and busy, pulsing and vibrating with people like a main blood vessel carrying surging like oxygen to the cells...", he thought.

"Dang! Now I can't even walk over it across safely because of without stumbling into the potholes and puddles.".  or [Dang! Now I have to navigate it like going through a commando training exercise! Give the reader better imagery using exaggeration.]