Help making a facebook App

Me and my friend has this awesome idea for a making app kind of like the mafia wars but with a different concept. Could someone please point me in the right direction for doing this! basically will be a stat game.
Answer #1
I want to build that kind of app to like Mafia or Vampire wars but I can’t find any information on this. How dopeople build this stuff? Can Anybody Help us?
Answer #2
Anyone please!