Go soul link all the way and corruption. For start, go corruption and then go soul link deep demo. Priest holy I guess is the best.
Make 4 pet attack macros. Each Voidwalker tanks his own pet, wait 5,6 sec and then dot once or 2x and wand.

At lv 30 respecc to demo, get hellfire and prayer of healing, pull packs using samemethod, but hellfire once. Swap to another pack. Best way.