[SnG.Scot_MisCuDI]

Too tired to go into explanation but hopefully with some thinking and trying you will learnl. Heres to get you started:
CreateVehicle - This one is obvious
PlayerSpectateVehicle - Used to set the players camera on the vehicle
OnPlayerKeyStateChange - Used for when the player presses a button to view the next car. And then shift to enter
PutPlayerInVehicle = So when the player presses shift it puts the player in the vehicle

Go from there. Cant help you anymore than that. Good luck