pyro there are different ways of looking at male/female molds. Here is a link that shows how to make a mold for a 32 streetrod body. The body he is pulling the mold off of would be considered the male or better know as the plug. Once the mold is completed it is a female mold. This link will help you tremendously if you will read it from beginning to end. It is for hand layup of parts, which I personally think is what you need to start with. My opinion anyway. BTW you can get a male mold by carving foam into the shape you want and prepping it to be useable just like the 32 streed rod body. Hope this helps.
Mike
http://www.hotrodder.com/32Blowpar/page10.html