I think sobi correction is perfect, only one observation:
It is strange to read someone saying he is "south brazilian".

I would say:

I'm from south of Brazil (or: I'm from Brazil's south region)

or maybe:

I'm a brazilian from south.

I'm south Brazilian, I like to speak English . I want to improve my English that's why I'm here. I want to teach Portuguese to American people and learn English from them.

First notebook entry: Introducing myself

First notebook entry: Introducing myself

I'm from south Brazilian, I  want study English. I want to improve my English better that's why I'm here. I want to teach Portuguese for American people and learn English with them.