Hi everybody!

My name is Jaime but my friends call me James.

I'm trying to practice english and take advantage of my free time.

--Names of languages are capitalized in English.

--You can just say "in my free time."

--It's more idiomatic to see "in my spare time."

----> "I'm trying to practice English in my spare time." 

I like to make new friends around the world and help if it´s possible to somebody that are trying to learn spanish.

--Capitalize Spanish.

--Rearrange some words and add some commas.

--Since you want to help people, you need the pronoun who instead of that.

--You can choose to talk about helping "somebody," one person, or "people," plural. Let's assume you mean plural, which makes a nicer parallel with "friends."

---->"I like to make new friends around the world, and, if possible, help people who are trying to learn Spanish."

Greetings from Mexico City.