Well, I would be magic...priest or mage preferably. Warlocks are my fave class, but I think their abilities would hurt you too, which I can't do pain
Mage gets the benefit of never needing to be thirsty or hungry, and powerful spells...would be useful.
Priests get the benefit of healing and would be an easy thing to be. And if I ever got hurt, I would heal my injuries away. That is very useful.
So priest or mage...as for race...
I would be a human. I wouldnt want to be short (gnome) or blue with tentacles on my face (draenei)...well draenei females are nice
...but out of males, I like humans the best on alliance. And they can be a mage or a priest, so it works. I wouldn't want to be an Horde race though. Funny enough, I really like playing as Horde.