J-type, I belive he does his by hand then scans them in and touches them up.. most of the modified photos are done using Adobe Photoshop, get a hold of this program. Its a good start. You could try Illistrator or a vector based program as well.
If you accually want to design cars, try getting a Cad program, (autocad etc) or at a pinch artistic 3d renders can be used such as 3ds MAX, Lightwave, Softimage... Not good if you are working out technical details, great if your just styling..
You can try applying for work experience at ford/Holden (pref after you have tried stuff yourself). But really any design studio is a start, the basic concepts of style and styling are simular for clothing, electrical equipment, funiture.
It can be a long road, try starting with small stuff. For example buy a remote control car and try working with its mechanicals and style a body over it. Get a portfolio together, show it around, peoples opinions are easy to get, but they are still worth something.