Recently, I focused on PvP for about a week or so.I'm a level 48 Human Warlock, and I was Affliction, so my old habits of just ticking DOT's and drain souling were really showing.Then I thought "nuking" My typical battle would be:
Seduce<Immolate<Searing Pain, Conflagrate<Soulfire or ShadowBurn.
OR
Immolate<Searing Pain< SB < SB < SB
This REALLY helped and I got on top of the boards in no time. So for respeccers, generally around my level.
Another Tip would to not overuse soul fire, because it's not that good unless your full shadow/fire gear.