Ritualist need help with building

hi guys,

i am leveling as necro now but want to switch to ritualist,before going in elite (lvl 74 now)

I want to focus on vitality dmg but cant decide if i need/want to focus on pet buffs/bonusses/gear, or that i should focus on my dmg vitality dmg?any suggestions advices?

and i am totally lost what devotions to go with…