Also, do not take your pictures in direct sunlight. The best time of day for lighting is right before the sun goes down. Over-cast days are the best.

If it is bright out, block the sun from the camera lens with your hand.

Since your camera probably doesn't have F-stops, and you probably can't vary your shutter speed much, learn to use photoshop for stuff like bluring the background so your car really stands out.

My dad is one of the better professional photographers in San Diego. I have picked up a lot of info through the years. I will post more ideas as I think of them.