If you're planning to do this. You should start small. I've worked on several projected based in virtual communities like this. And they all end premature because some members bail out. So if you start it make sure you can finish it alone or with somebody you know really good (in real life preferably). Then when you've ended some small projects with succes you can try bigger ones. People need to see result if you want to keep them on the project.

If you're going to do this. I can do some adventure writing. But not alone, I need to work with some native speakers.