When I PVPd as affliction at 80, I started with crafted gear, which was barely getting me by. So I glyphed for survival- anything that helped my heatlhstone, drain life doing more, etc. I also used voidwalker for the sacrifice. Once I got my resilience higher, I started changing my gems and glyphs over to more damage stuff.
The key talents for affliction PVP are instant howl of terror and Curse of Exhaustion, which was just nerfed. Some people debate whether to get COE, but I find it useful if someone is running by me carrying a flag (especially if they are using something like dash) or if someone mounts and tries to ride towards your flag carrier.
I would have to just say there is no such thing as a rotation in PVP... to me everything is situational. But ALWAYS keep haunt up for healing yourself. And when I fight large packs of horde, I use seed of corruption.