When you first start, kill all the monsters as usual and exit the tavern. After you exit, kill all the monsters up to the Academy. Do not get too close to the top of the Academy or the game will start your next quest. Run back down to the tavern and enter it. The monsters should have respawned. Kill them again to get experience. Repeat this and you should get a good amount of experience until you are at about level 30. This works especially well for Knights to do their Aura of Valor.