Leica camera identification is really not all that difficult. First you need to figure out which of the major camera series it belongs to. If it is a plastic autofocus camera, we can't help you. They are very recent, and I'm not going to list them here, as they will continue to change. I think most of them are model identified on the top or front anyway. Otherwise, if it's 35mm:
If it is an SLR, go to Leica SLR cameras
If it is not an SLR, and it has a button to release the lens, which bayonets on and off, then go to Leica M series cameras
If the lens either threads off, or is fixed to the camera, but collapses, go to Leica screwmount cameras
