Horde, starting over, suggestions?

Hey I took a break from WoW and then came back for Classic. Now I am taking a break from Classic and starting over on a new Retail server. I was wondering if any classes or roles are in need for PVP or dungeons? I lean towards playing a range caster or healer. I was playing a druid and priest in Classic. There were never enough tanks. I realize Retail is much different so thought I would ask here. I guess the end game for me would be M+ and PVP battlegrounds.