Though I haven't been to the Indy show, I purchased my new baby at the Tinley Park, IL show last month. It was great to be able to look at so many corn snakes and choose, plus you will be able to pick up items you may still need. Do you have the Corn Snake Manual by Kathy Love yet?
There will be experts there that you can talk with also. There are several different ways to go about housing your snake. My yearling is in a 20 gal. "long" tank, and my baby is in a 10 gal., but you certainly may start out with a small plastic container if you wish and use "heat tape" for the heating source.
Both of my tanks have a water bowl, two hides, a branch to climb and aspen substrate. I have a heat pad under 1/3 of the big tank, and heat tape under 1/3 of the 10 gal. Now that summer is over, I use a spray mist every once in a while to help with humidity. (I do have a thermometer and humidity gauge in the larger tank)
Cornsnakes are wonderful, and easy! Basically you need water, 2 hides, and a heat source on part of the tank, with aspen, newspaper, or some other substrate (and pinkies of course!) Good luck and have a great time in Indy!