dgridley, I too am a huge paintball fan. I'm on a Neenah based team(Wolfpack) and we play once or twice a month.
I'd recommend renting equipment the first time out or find some friends that can lend you good equipment. At minimum, you'll want to use a good anti-fog mask that fits your head well. Most rentals tend to fog and fit adults too tight. When your vision is affected, it takes a lot of fun out of the game.
Getting hit only hurts when your adrenaline is low

Those welts induce years of story telling.
Be sure to wear good comfortable boots and thick socks. Bring lots of WATER and stay hydrated.
Have fun!