Druids, Paladins, Rouges, Warlocks, Mages, Priest, Warriors, and Hunters
to break it down...
Druids = Back up Healing skills with morph abilities into Animals with a jack of all trade skills to give you a taste of all (Bears, Panthers, Sea Lions, Night Owls)
Paladins= Your basic tanks with Healing and boost skills (like armor increase for 5 minutes or something
Rouges= Stealth mode, theif like skillls, dual weild weapons at level 10
Warlocks= Have minion side-kicks that get cooler and stronger as you go higher.
Mages= Strongest magic attacks with no minions however
Priest- Risky to try these out but all they do is heal and have holy attacks, but ALWAYS needed in a party or group or raid...and seriously come in handy against the Undead. Great for praticing mult-targets to heal
Warriors- Strongest of the bunch, but cannot heal themselves, can lure away a horde or pack of enemies so your team can attack and heal you from a distance.
Hunters- Can tame live animals and use them like Minions, except you gotta feed them and they do level up just like you, very fun character to have, since it's like 2 characters you're balancing
Night Elves are very popular!