Wargen and goblin you cant,, need to do starters as said above
Im pretty sure the wargen starter quests take place before the cataclysm to, so would make sense.

With the other races its basically getting them all to the same starter race as main but ive just remembered this beuty of a perk. 'have group, will travel' WIN!!

Just started on the druids but gonna try it out on my mixed team, hopefully they can all do the same starter quests.

Not easy multiboxing without my main there for horsies, bags, boosting and what not.