I am an idpa CSO, SOI, shot & worked Nats, Worlds, a bunch of state matches. I AMD & CSO at my local club but decided to start my own to control match quality. Props needed are walls & barrels. You can put on a good match with little else to start. Do paper scoring to start, cheaper than buying pads. You need targets, tape, target stands. The key to a good match are good stages, I can't emphasise that enough. Nothing worse than showing up to shoot a match with crap stages, unless you just want to pull the trigger. Imo it requires quite a bit of creative thinking or attending good sanctioned matches to design good stages. You can of course go on line & find 100s to adapt to your range. If the 4 bays are wide enough or deep enough, you can set up 2 stages in one bay. If not, 4 main stages with a single target drill in each bay as a starter, gives you 5. Add a 1-2 target stage at the end in each bay for 6 stages. Lots of ways to fit more shooting into,a small range. If you want to be a legal idpa club, you need yo go online & reg & pay a fee. Try it out first, then decide if you want affiliation. You'll need certified SO at some point. You should download the rules & be familiar. Nothing irritates good shooters like stages that dont follow the basic rules. Good SO staff make any match run better. Have fun, be safe.