To try to stay on topic and be more helpful though:
One quest I would recommend doing at lower levels is the Crushbone belts in Clan Crushbone. This zone is located right off of Greater Faydark (close by to starting areas if you're a Wood Elf, High Elf, Gnome or Dwarf).
Anyway, you kill orcs and collect Crusbone belts. There is a NPC in Kaladim (Dwarf city) that you turn the belts into. It is infinitely repeatable and very good exp from about level 4-10. You will get a decent amount of exp and a piece of armor to be worn or sold for every single belt you turn in. Even at higher levels, you can farm these belts and sell them to players for some pretty decent cash
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Another thing to point out is that quests like this do not have to be initiated at the NPC before beginning them. Using this one for example, you can collect as many CB belts as you want before even talking to the NPC who is associated with the quest, and still go speak to him and turn them in after. I don't think this would apply to all quests, because some stages and such.