When I first got started with IPSC a few years ago they had local practice nights where you could come try a couple stages even if you hadn't done the black badge course yet. I don't know if other ranges do this, but it might be worth looking into. You should probably have some shooting ability before you take the course, but you could also learn quicker if you dont already have a bunch of bad habits to unlearn. My wife had barely shot a handgun before she did her black badge and by the end she was shooting better than some of the guys that had some experience. One or two of them had been to a bunch of our practice nights before doing the course too. I've done a few IPSC matches and use a $20 or $25 Blackhawk holster, pretty much the cheapest one they make. Not the SERPA model, just their plain Jane plastic holster. It came with an adjustable belt mount, but I ended up making my own that is much more solid and puts the gun lower. At first I had a couple cheap double mag holders, but replaced them with angle adjustable single ones pretty quick after my black badge course. The competition specific belts are nice to have, things stay where you want them better, and I actually bought mine from my black badge instructor during the course. Smart guy, he had one that was my size and offered to let me try it to see what I thought. Having stuff stay put is pretty important when you start trying to pick up the pace a bit.
Kristian