Aion has 50 levels (aion gold). The only way to improve the level is to gain experience points. You gain XP in Aion by killing mobs, completing quests, and gathering resources. You will kill mobs while questing, raiding, or simply camping a grind spot. Every time you collect your resources a hand-made with XP in return.
The quests in Aion are run-of-the-mill: Kill ten (insert creature name here); Deliver this to that person; Go talk to him who will send you over there and then you report back to me. They don't really differ much from the quests you'll find in WoW. You have special campaign quests though, which provide a deeper storyline. These are usually associated with cinematic cut-scenes.
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