Sounds like you already have a vest, but in case not then look at this.
http://www.cheaperthandirt.com/product/2-UTGPVC-V547BT
Each mag pouch (4) holds 2 mags (8 total) and has 4 pistol mag pouches.
On the 1,000 rifle rounds needed, that is a bunch. I would get a repair kit for the rifle you are going to use, extra firing pins, FCG springs, extra buffer and spring, and maybe a extra bolt assembly. Firing that much ammo in one or two days will put a lot of wear on the parts. Or bring an extra AR if you have one, if something breaks it will put you out of action and waste a lot of money that you spent for the class.
Good luck and shoot straight.
Jim