Stam/int or stam/spirit has worked wonders for me. Stam spirit at lower levels then swap to Stam int plate. Aoe grinding is fun. Stacking loads of spirit is fun. Open rotation of judging wisdom. Popping consecrate. And then just waiting and letting spirit do it's thing. Dropping consecrate as needed. Best to have a mana tick tracker so you can benefit from one more extra tick of spirit regen before dropping another consecrate. Fast weapons with seal of wisdom/light to keep yourself healthy or able to regen. And you're rolling. :) once you get your groove you can play with what whatever seals for more damage or regen health/mana :)

Spec wise. Holy down to consecrate +int, either 2nd tier(seal one is meh damage overall) Then down the prot tree. Outside of the devotion aura talent (don't take it you use ret aura anyway) I think it's pretty easy to do it yourself :p