Thanks Ryan! Here is a photo of my setup:
There's more equipment above than average hobbyist might have, however, the same effect can be achieved with items from around the house or a trip to Michaels. The soft box can be replaced with a desk lamp placed above a couple sheets of tracing paper, a white pillowcase, shower curtain etc. to soften/diffuse the light. The key is to place the diffusion material relatively close to the model. Experiment by moving the lamp closer and farther away from the diffusion material to see the effect on the car. You will likely have to block light from the lamp from hitting the background - try placing some black construction paper behind the light (opposite the camera). Also try rolling out more paper (moving the background farther away) to get a nice gradient effect.
A more basic point-and-shoot camera will work nicely, too. Just put the camera in Manual mode and adjust the shutter speed, aperture, ISO until it looks good on the screen. Bracket your exposures - try a few that look brighter and few that look darker as they may look different on a computer screen.
You can use a cellphone camera but it would be best if you can manually adjust the exposure. There are apps that allow manual control of the camera but you should be able to adjust it by tapping on the screen and adjusting the slider controls.
Hope this helps :^)