Cornsnakes are mega easy to care for. "Normal" room humidity is fine for them. I turn off the heat and keep mine at room temperature during the summer which is about 80, then during the winter I turn the heat back on keep them at 82 on the warm side and the cool side is around 75. Plastic bins are just fine for them. They aren't picky. If it's a hatchling use a smaller tub until it gets larger. Minimum size for an adult is a 20g long tank. I feed hatchlings every 5 days, then every 7 days for yearlings, then 7-10 days for adults.

I'd definately recommend picking up Kath Love's book: http://www.amazon.com/Corn-Snakes-Co...7280432&sr=8-1

A must have for any corn keeper.