Hello Italki

I can speak basic English. (,) I'm (im) still studying to improve and (. I) need your help (,) if you are a native speaker.
I can be a good friend as well.

A good start. We would write the title with initial capitals, just as we would for any names or places. Hence, 'English' needs a capital 'E' and your country would be written - 'Thailand'. In addition, the letter 'I' on its own is always written with a capital 'I'. The word 'I'm' is short for 'I am' and needs to have the apostrophe ' to show the word has been abbreviated (shortened). I have suggested combining your second and third sentences into one as it reads a little better. 

Hello italki

I can speak basic english, but im I'm still studying. I need your help, if you are a native speaker.
I can be a good friend as well.

This is great! I personally think that "If you are a native speaker, I need your help" flows better, but it's perfectly understandable the way you have written it too :)

Hello italki

I can speak basic english, but I'm still studying. "if you are a native speaker,I need your help." I can be a good friend as well.