help me!

thank you. it's very important to know my errors because i want to learn english.

*It's very important FOR ME to know my mistakes/errors because I want to learn English.

"I" and "English" are always capitalized.
Other languages and nationalities are capitalized too.

English / Japanese / German / American √
english / japanese / german / american X

Why "I" and " English" are always capitalized?

*Why ARE "I" and " English" always capitalized?

Languages and nationalities are always capitalized.
For some reason, "I" Is always capitalized as well. I have no idea why, though. Sorry.

No problem this was my curiosity. Which is the difference between my and me?

*No problem, I was just curious.
*What is the difference between my and me?

My shows possession. For example, "My brother is mean" or "My book is very interesting"

Me is used after prepositions (I think). For example, "She is nice TO me" or "He is talking WITH/TO me" or "My dog is sitting ON TOP OF me".

My english is terrible. You what language studies?

*My English is terrible. (don't forget to capitalize "English"!)
*What languages are you studying?

I'm studying French, Japanese and German ^^
And no, your English is not terrible !
If you keep writing entries on Lang-8, you will make a lot of progress in no time !

How many time for learn for you ?

* How long have you been learning these languages ? / How long have you been learning them ?

I've been learning French for 12 years, Japanese for 5 years and German for a couple of months.

Are you learning for 12 years?? Is complicated the Japonese?

*You've been learning it for 12 years?
*Is Japanese complicated?

Japanese is the easiest language to pronounce. The pronunciation is extremely easy. Japanese grammar is also very easy. What is difficult about Japanese is the writing.

German is much harder than Japanese and French, at least in my opinion.

How long have you been learning English?

I have learning English to the school but in my school it's not very important. I studied English only two hours to week.

*I have ben learned English in school, but in my school, it's not very important. I studied English for only two hours a week.

Oh, I'm very sorry to hear that.
The fastest way to make a lot of progress is to watch TV and movies in English, and to read simplified books in English (like the Penguin Books series for ESL students).

I don't speak English to 10 years. I don't understand the tv and the movies. I would learn before to write and after to speak.

*I haven't spoken in English for 10 years. I don't understand TV or movies. First, I will study how to write and then how to speak.

Maybe buy an English textbook and work on that first. After you have finished your textbook, THEN buy children's books/simplified books and watch TV and movies in English. You can use English subtitles when watching movies.

Good idea! I have the book of my school. I will try children's books in internet and in ebay. Can you say some title?

*I have my school's textbook / the textbook that my school uses.
I will buy some children's books on the Internet / on eBay.
Could you suggest some books?

Yes, anything from here:
http://www.amazon.it/s/ref=nb_sb_noss?__mk_it_IT=%C5M%C5Z%D5%D1&url=search-alias%3Daps&field-keywords=penguin+reader+%22level+1%22&x=0&y=0

Only buy "level 1" books. Level 1 is the easiest.

ok. I see some books much nice. I buy tomorrow. What used "s" and "es" how plural?

*I see some very nice books. I will buy (some of) them tomorrow. When is "s" and "es" used in the plural ?

To be honest, I am not sure, because I have never studied English grammar before. You need to buy an English grammar book. Native speakers don't know grammar rules ... except for English as a Second Language teachers, of course.

I will take to buy the grammar book.