http://www.jdlawhon.com/tutorial.html
I found this, along with the leatherworker.net forum here, to be invaluable when I was gathering supplies to make my first holster. I made a few for me, then a couple for friends. Next, I advertised a few for sale on various gun forums. I also displayed a few in a friend's gun store. Last year, I sold enough to pay for all my tools and supplies, along with a few handguns I can use as molds. Notice I didn't say blue gun molds, I said guns! I enjoy it a lot.