Now I've attached a link to the USDA site where you can check out the rules and regs and see if you qualify. There are location limitations, rural properties as they define them, and income limitations, based on some regional norms. Both you and the property must fit their guidelines to get approved.
As you read over the site you'll have questions. A great local lender who has experience with these loans will be able to answer them and explain the program to you more fully.