WTF is so hard to understand about the consens here?
Go watch some mage PvP-video, and if you have the same skills as those players, and still get owned, then come back and complain about imbalance, if you are a NAP, just accept it, watch more PvP-vids, also the ones of "evertas" "vurtne" "foz" "oblivinati" the taco-series. after some vids you will probably change your attitude to something like : OMG, I'm a clicker, have no macros and turning skills, I NEED TO LEARN.
For your gear question: If you want hp and damage and surviveability, it migt MAYBE be already obvious, that you want a PvP-set. If you cannot figure this one out for yourself you have serious issues.
Start with the gear you will most likely keep for some time. Since we are no RL-magicians we're unable to tell you at what date exactely blizz is gonna introduce s4, but my general opinion would be: save the honor, and do some arena. You can always get at least some arena-points by just playing 30mins a week.
When s2 is buyable for honor, just buy some pieces, and farm honor for the other ones, when you're done getting all the gear that can be purchased by honor, you should have done enough PvP, to understand other classes, and develop some skills + you might already have modified your interface to something useful. Also then you'lll have enough equip to not just get pwned instantly.
This is my advice, and it worked fine for me in season 3, getting s1 and vindicator + s3 gloves. I am now happy with my progress, and if you'd stop laming around here you might eventually log into your account, and try out some of this before you go on here.
there is no fast A-B way for this case, simply, because success and gear in PvP depend on more than just a clever game-strategy. you'll need skill and some gear in advance, good partners, gold, more skill, and reflexes. Its not something you'll get by just doing some certain trick, it takes time.