Yea, like ChahDresh said,
Every 2 levels you are able to upgrade your spells + skills. Each have a set price to train in it. Im guessing there are specific trainers for each class in most or all cities. Im not in beta yet (Hoping tommorow for OB). Dont know the locations of the trainers, just know each have a set amount of gold/silver/copper and a level requirement. Hope this helps a little more.