I'm thinking of entering in some IDPA events for fun. Looking at their website, my Ruger P95 falls in the "Enhanced service pistol" class since its da/sa. I have the gun, an uncle mikes belt holster and 2 magazines. How many mags do you need? About how many rounds should you bring to shoot? Is it a decent venue for rookies like me? Thanks. Is there anything else I should have that I'm not thinking of like...mag holders for your belt or something.