I'm excidet (I'm excited)
Hi my name is luca, i have (I am) 18 years old and i (I am) from to Rome. This is my first note, and i don't know that i'm reading. (I don’t know what I am writing) I have started to study English of few day (a few days ago) because i would like will leave (I would like to live) in London to work. In this period Italia (At this time, Italy) isn't a good country, because there is much corruption and indifference. I went (want) to go in London any month ago, and it is a beautiful place.
Now i go to sleep (I am going to sleep now) because tomorrow I start the school.

Good night.

Hello Luca,

I know it looks like a lot of corrections but I was able to read and understand what you wrote.  Good job.  Good luck with English!  

I'm excited!

Hi my name is luca, i amhave 18 years old and i am from to Rome. This is my first note, and i don't know what that i'm writing reading. I have started to study English aof few day because i would like will liveleave and work in London to work. At this time In this period Italia isn't a good country how can this be true :(, because there is a lot of much corruption and indifference. I went to go in London any month ago, and it is a beautiful place.
Now i am going to sleep because tomorrow start the school starts.. good night.

Good luck, Luca.  Not everything I changed is completely wrong, but it's good to learn some alternative ways of saying things.  London is a cool city.  I don't know if it's as cool as NYC, though. :P