Here you have a little more control and a community that's better with what you described. Railroading is frowned upon, but if you shift people to a natural course and keep things fresh, you should be able to move just fine. Keep people active and make sure they are engaged; a week without posts either IC or OOC isn't a good thing. I suggest you learn how the guild at large works and read up a little on multiple other roleplays first, and ask perhaps advice from some GM's you find inspirational text from. I might be able to find a few folks who would be willing to give some tips to ya. To keep an interesting story line... plot twists, a clear goal, unity in how things operate and a clear end in some cases should keep things going.