Economy is messed up already, so don't worry too much about that.
On the note of quality, make sure it doesn't break itself. Players shouldn't be able to get trapped, nor should their clients crash. Other than that, make it feel coherent and intuitive when playing. It's important to remember that the vast majority of players will run your quest at most once, so try and make things as obvious as possible. Keep in mind what parts of the game are enjoyable and what parts are a drag and capitalize on the enjoyable parts and cut the boring parts. For example, if you're putting a switch down a 2-3 room dead end, have mobs spawn on the way back after the switch is flipped. I would also recommend keeping in mind how long the quest is. Quests tend to start dragging around the 30 minute mark, so keeping it fresh and interesting, or short and sweet is important.
Feel free to send me a PM if you are serious and want some resources to help you get started, or just need some help. Good luck!