I believe that almost everyone on this forum will say that is is imperative to get a book on corn snakes before you actually buy one. There are two books readily available: "Corn Snakes" by the Bartlett's and "The Corn Snake Manual" by Kathy Love. I've got both and would highly recommend the one by the Love's.
But in the meantime, there are some actual pictures of good enclosures not too far down the forum, and all the discussion you will ever need on feeding. There are also dozens of care sheets available on the web.
Good luck. And be forewarned thet this hobby is very addicting.
Cindy