First off, calm down! What level of experience keeping herps have you got? Before you can run, walk. Find out by using the search and faq sections here about the basics of raising a corn snake. Buy 'the cornsnake manual'. Read it. Read it more. ask specific questions here. Read up more. Start getting your setup ready. Read more and ask any questions that are realy stumping you. Then think about getting a snake. Read more. And so on.
I'm not trying to put you off or make assumptions about you from your posting, but a lot of your questions could be answered by yourself through some basic research. But if you do get a snake, remember, we will demand photos!