Making A Driveable Car?

Hi, just made a new account because my previous probably got deleted as I didn’t use it to much=D


After searching and looking through like 80 help threads I can’t find a simple tutorial on how to make a drivable car for gmod. And I’m not talking about the cars you make in-game, but model with 3DS max or something and make it an add-on. The lack of hi-poly cars with sweet ass sounds made me want to make one myself, because all I can find is lo-poly jeep sounding junkers.
So: How the hell can I make a drivable car for Garry’s Mod? =D

Thanks in advance