Priest heal build
stats: offensive: 250 swift, 200 DA, all rest on brutality; defensive on 250 caution, some vitality.
rotation: kinda no rotation for healing. prioritize your heals that do the biggest numbers :p you'll get to know how it works, we're human after all.
Priest support build
stats: offensive: 300 DA, (perhaps 250 crit chance / crit dmg, did not test this), prof/bruta about equal; defensive: 250 caution, 200 concentration, rest vitality.
rotation: spam divine sentence along with holy rage, holy rage is off gcd (global cooldown). try apply heavenly smite to some big hp mobs because it will apply vulnerability(if you use divine sentence on a heavenly smite debuffed mob) if they are not red rings (bosses). TA to speed up (nuking). you're cleansing flame debuff should rarely ever run out. glint to get out of circles real quick if you can't do it manually. luminary to selfheal but use it more as bonus dps (it's an insane aoe, along with chain of light), use frenzy to boost up particle of light dmg, elsewise I wudn't use particle of light. simple class, simple gameplay
have fun!