"Healers have to die" and "Battle Ground Targets" work well for finding healers and also falling in on the focused target pain train. BGT has the ability to right click on the box of the other teams names to focus them and or left click to target so best way to get focused. You can also set it up to display by range so it will highlight what is near you for killing, also displays health and if they are alive or dead (shades it out if they are dead or shows how much health by a slider bad).

AOE you have to live through it. What can you do to toughen up. The stoneskin bulwark totem, pop pets/1-2 elemental, or pre-emtively drop some healing rain or some heal stream totems to help you live through the initial CC spam.

If you are elemental it is harder due to having to hard cast. You probably should try to spread out a bit and have an IWT with a step back to turn towards the target with out really moving. Just some ideas.

As for enchant I normally do the 200 resil to chests, match slots for PVP resil bonus maybe. There are some more experienced PVPers that will chime as I normally solo-box Pandaria PVP in RBGs.