I'd like to emphasize, too, that attitude is FAR more important a trait in a mentor than aptitude. Even if you're TERRIBLE at the game, can't tank or heal, your DPS is in the gutter, break every craft, and haven't even managed to harvest an onion without being savaged by wild beasts - you can STILL be a positive force that helps new players to feel welcome to the game.

Keep an upbeat attitude and endless patience, and you'd be surprised at what folks can accomplish.