Make a tutorial on making quests
I made a trial quest and launched it just so I could see what people would see if they were playing my quest. It cost me 100 points, and now I cannot make another quest. A tutorial would have alleviated this problem.
Alternately, you could simply allow quest creators to play through their quests. I am already active in a local quarterly treasure-hunt-style game ( www.midnightmadnessbrevard.com ), so I'm familiar with the importance of a "dry run". The ability to playtest your quests can mean the difference between a well-made game and a complete failure.