I'm no expert, but I use a Sony Cybershot. I bought a small tripod at Best Buy and I shoot straight down. I use two desklamps with cfl bulbs.(I have Reveal, White and Daylight.) Always use the same type of bulb in both lamps and turn off all background light.(The camera has a hard time adjusting to different types of light.) Most of the time the lamps are at 12 and 3 o'clock but depending on the coin you may have to move them around to get optimum lighting. Then it's just practice, practice, practice.
Also I use a free downloadable editing software called photoscape, that will help with white balance and cropping and templates.
Hope this is helpful. Here are a couple of pics using my setup and Photoscape.
