Avenger shield to pull and grab initial aggro.
consecrate - aoe
holy shield - reflect aoe
hammer of the righteous - 3 mobs

judge and hammer them as often as cooldowns allow.

those there are all you really need.

also use:
seal of blood
blessing of the sanctuary.
devotion aura or ret aura, depends on your liking.
shield spikes.

if you have 3 mobs, you will never have to change targets.
hammer of wrath fleeing mobs or mobs about to die if you have enough mana. with blessing of sanctuary and 3 mobs, you shouldnt have any issues.

as far as stats go, stack stamina. there is a talent that converts stam to spellpower. attack power is minimal.

all i can give you now. good luck!