Hello Jose, you write very proficiently in English.  Overall, you have done an excellent job with your grammar, vocabulary usage and sentence structure.  I have rewritten the first paragraph to try to make it flow more smoothly.  Some things that I have changed were not exactly "wrong" but I thought they would sound a little more natural if written differently.   I've added some notes below.  Please feel free to ask me if you have any questions.

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Could you imagine a home where there is not at least one TV? Nowadays TV seems to be part of our daily life.  In some ways, it could be argued that we see our world through the TV, that is to say, any news or information broadcasted by any TV program immediately influences us. What is more, the series main character's behavior is often imitated by teenagers. Taking this into account, the debate arises about whether the time our sons and daughters spend watching TV should be limited or not.

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Notes:

Commas do not seem necessary when writing "there is not at least one TV."    "At least" in your sentence is talking about how many -- similar to saying "take the medicine no more than three times a day" or "it will take a minimum of 20 minutes to walk to the train station."   When saying these sentences out loud we do not pause before or after saying "at least"  "no more than" or "a minimum of," and thus it seems natural to not use a comma with them.   However, commas can be necessary when "at least" is used to provide a transition in a sentence (and we usually pause before and/or after such transitions).  For example:  "Why is she mad at you?  At least, I assume she is mad because of the tone of voice she was using." or "She hasn’t got any children. At least, I don’t think she has."  

I changed "a TV" to "one TV" because it seemed to me that you were talking about the number of TVs you typically find in a house (rather than discussing whether you might find a TV or some other similar item).  It would sound fine to say "a TV" if you had written something like, "Electronic devices are now common in the homes of even poor families.  Could you imagine a home in which there is not at least a TV?" 

Transition words or phrases are good to use and will help your English sound more proficient (transitions such as "However", "As a matter of fact", "From my experience", "On the other hand", "Furthermore").  However, I suggest using only one transition word or phrase at the beginning of any sentence.  Using two transitions together at the start of a sentence can sometimes seem to cause too much of a delay before getting to the main idea of the sentence.  ("as a matter of fact in some way" felt like two transitions to me, so I chose to keep only "in some ways."  "What is more, from my point of view," also felt like two transitions, so I chose to keep only "What is more.").  And it's probably best if not every sentence starts with a transition word or phrase -- too many can feel like "clutter" and slow us down when reading.  It's good to keep some sentences simple and straight forward.

Is this the kind of editing feedback that you are hoping for?   I think different people want different types of responses when they post notebooks on iTalki.  Before spending more time correcting your essay, I would prefer to know if you like to simply have the native English speaker post their revised version of your paragraphs or if you like to read the explanations about the reasons they have made the changes.