I'm currently in the same situation as you. What position are you planning on being? For example: I'm Directing, Editing, Writing, and compositing (if that's not the same as editing). Currently, I'm storyboarding, and location scouting right now. I plan on doing a casting call after I get my locations down, and also the storyboarding. Before all that though, you should get the budget down, and get the equipment for the shoot. That's my advice at least.