as healer the it's deff. priest disciple one holy is decent,shaman can work as well but priest is the easiest,and for melee try survival hunter it's rly easy to play basicly throwing axes the talent you get when you hit 15 and flanking strike which deals a lot of dmg,it's insane,other than survival hunter you can try playing ret pala it's great supportish class with some nice offhealing,as well as the hoj which is 6 seconds stun,and the third class is warrior(arms) but they depend of healers way too much + can be very punishing if you go all in,i would stick to survival/ret if i were you,hope this will help you decide what you want to play