Everyone here is talking about the the airplane...let's talk about you and your partners. You might want to consider spending a couple of hundred bucks and having a legal type person draw up a partnership agreement. Entry requirements, sharing of the fuel, oil, mx, major issues that might come up, and most of all exit strategy just to name a few. I've seen too many partnerships turn sour because someone didn't pay their share. What if, God forbid, that one of the group looses a medical or worse yet gets t-boned by an 18 wheeler on the way to the airport and earns angel wings in the process? Who pays for his/her share now?
A little up front legal paperwork that is signed, notorized, and binding may go a long way to prevent a major rift later.
Just my two cents.
Oh, and by the way.... sounds like a hell of an idea!! Go for it!!
AOPA would be a great resource, as well as what everyone else has said.