Thank you for your help.

At the moment I'm leveling a Paladin/Mage Combo for RAF and I think the heal is really good for some situations.

So I also might go with Warlock/Priest later.

A little question: Is it worth it to dot around everything and then loot or just to make Single Target damage? Is it really much faster? Because I see some problems with dotting around everything, because of pulling other mobs, increased change to die, ... Also the mobs in Azeroth doesn't have much life and if you do Single Target they die within some seconds.