it takes 2 things to become good at pvp in any game:
Practice and Patience
You will get owned in the beginning and it will seem unfair. But if you stick with it, you will learn how to counteract these things, and soon they will become easier to deal with.
but it might have been easier for me because my first toon was a stalker so i knew exactly what i did wrong when i played my corrupter in warburg and got AS'd, because i had done it to many other people