I would spec the priest Shadow or even Disc no need for holy as such low levels. For the shadow priest I put 5 point in improved wand. I pulled with a spell and spammed wand the rest of the time while my main who was a paladin did most of the dps and all of the tanking. Once the shadow priest gets higher in level you will be able to leech mana but again with things dieing so fast you will not gain much back.

Drinking 3-4 pulls is not uncommon. You could always go feral and not worry about drinking at all.

*edit* dang spelling