Just like shopping for anything else, you're going to go through several stages of gathering information, deciding what you like, figuring out your budget . . .you may end up working with a Realtor to help you, or you may want to go it alone.
You'll probably need a mortgage, so the bank will also be deciding whether to lend to you .. . the info you'll need to give them is to verify your financial circumstances, so expect to have your most recent paycheck stubs and tax returns handy.
If you are first-time buyers, you might also enjoy my book.
author, "Diary of a Real Estate Rookie"
Insider Real Estate Tips with a Twist of Humor: http://tinyurl.com/2ag28z