Vehicle Compiling, attachment locations and QC.

[Jammarman]

If anybody is willing to help me I would like to know where I need to put all of the vehicle attachments, location and rotation, and then what I need to do in the QC to get a driving vehicle in gmod. I am using 3ds max and WallWorm and I have exported my own models into source before. At this stage I am not worried about the visual animations I will figure them out once I get a physical vehicle working.

I have managed to get a vehicle into source but it it only drives forwards and backwards, if I try to turn it will spaz out spinning left or right(not always dependant on which key I press).
It will also sometimes crash the game when I spawn it.

I am using a concave bathtub shaped collision hull I hope that is ok for vehicles.

Any help is much appreciated :)