Why don't you join the ones allready started. Now you are starting a project of your own, and, like the other projects do, you start looking for people to help u.
If you want to go on with it: good luck.
For ideas and what we want, just take a look at the other projects and their treads or websites:
Car specific: iDash, AstraMac, i3, TatraMac
Not Car specific: iTheater, CenterStage