Correção de texto: Writting skills

Well, my name is roger lourenço, i'm from santa catarina - brazil, i'm doing a english course but also studying much things by myself, because i wanna be a english teacher, i concerned that my writting skills is awful, i discovered this site throught a english teacher and he recommended this site, i have much problems when i need to write some words which i don't konw how to writte, i ought to pratice more and improve it, and this is that i'm doing, thank you guys.