First of all I think it is "everybody" one word.
Then, the best to improve your skills is exposure, exposure, exposure. Try to read, listen, and talk as much as you can. The most difficult thing is to improve your writing skills because you will need somebody with a good knowledge of English to correct your mistakes.
Listening to music is great help (try to have the lyrics) so you understand what they say. That helps you with your pronounciation too.
Good luck!