Excellent post from Jim. There is some great advice there.
At your first match, you ain't going to win. Just go and have fun. If you do happen to win, at your first match, with a sub compact large caliber gun, with no mag pouches, against people who have years of experience, then you are channeling Rob Leatham. But for the rest of us we shoot for the practice, experience, and fun.
With 6 round mags, then you are going to get plenty of practice reloading. I mostly shoot CDP, but strangely the guys shooting SSR (revolvers) aren't that far behind the rest of us.
Plus you are allowed to top your gun off before the string. So you will go in with 6+1.
Just go have fun. Pay attention. Watch the good shooters in action.