Affliction pvp build. 2 spare points,imp coa or imp drain soul (for threat in pve)
Felguard pvp build.
Destro pvp build.
Make arena team as soon as possible,doesnt matter if you aren't good ,what matter is to stack points so once you get your personal rating up you can get all them fat epix.
Sl/sl is way to go in 2v2 and 3v3 (although you can find quite alot of ua/shadowburn locks 2200+).
Farm battlegrounds,get blue gear 1st,when you get enough honor ,start gettin s2 gear,oh and in case you dont have it 1st pvp item you should get is TRINKET !
Cheers,happy pvping