Go out to the range and try out all the pistols and buy one that fits your hands and go practice. Talk to all the shooters and ask for advice, they've been through the same steps and most are of great knowledge. I always suggest buying the best you can afford. It's cheaper in the long run as you'll upgrade soon.
Holster: Bladetech, CR Speed, Ghost, or GR.
Mag Pouches: (about 5): CR Speed, Ghost, or GR.
Belt: CR Speed
Range Bag: You need smth big and sturdy. Shooter's Gear or Green Mountain.
PS: Look around ..... most shooters use the same gear. It's for a reason.
Pistols
Production: Stick to 9mm as it's cheaper. The recent trend seems to be the CZ design with the full dustcover ie.. CZ SP-01, Baby Eagle, and Tangfoglio Stock II are the best bets. I used a G17 before but am goign to try the SP-01 this year.
Standard
40SW is the calibre of choice. You can use 9mm but shoot minor. Most ppl use the 2011 design but the Tangfoglio Custom Sport is coming on strong. I'd suggest STI or SVI for the 2011 design. SVI you are looking at the big bucks <$3k. You can use a Single Stack if you already own one, i'd skip single stack design if you are buying a new pistol.
Open
.38/9mm is the calibre of choice. The pistols are very very similar to Standard but with scopes and comps. STI/SVI/Tangfoglio rule.
Revolver
Just have fun!
Click on the link below to review the rulebook
http://ipsc.org/pdf/RulesHandgun.pdf