My first try

Hello everybody! I´ve decided to sing sign up here because I want to wanna (wanna only in spoken English) learn more English, for fun and because in my future career it is very important to mastering languages.
I´m 26. I´m from Spain, and would be happy to meet new people for learn us each other so we can learn from each other.
See you later!

My first try 

Hello everybody! I´ve decided to sign up here because I want to learn more in English.  It is for fun and because of my future career it is very important to master the languages.                                  
I´m 26 years old. I´m from Spain and I would be happy to meet new people to  learn from each other.

See you later!

My first try

Hello everybody! I´ve decided to sing sign up here because i wanna (for spoken English, this is correct, but in more formal settings, you may want to use "want to") learn moren English, for fun and beacuse because, in my future career, it is very important to mastering languages.
I´m 26. I´m from Spain, and would be happy to meet new people for to learn us from each other (you could also say, "to meet new people in order to learn from each other).
See you later!

*Good job.