One thing I haven't seen mentioned is hunt logs, which are a great way to get you high enough level to dungeon spam (so basically levels 1 - 15). After you get to level 15, just make sure to go to the Smith (there's one in each of the three starter cities) and do their exercises for some good gear and an exp bonus ring (if you don't have it already). Then do your daily leveling roulette, and after that just queue for the highest level dungeon you can. Dungeon spam is the best way to level for a tank or healer. DPS are better off using Palace of the Dead floors 51-60 spam because of the dungeon queue times for them.