Back in the day, there was so much available land in the U.S., especially in Kansas and other Midwestern and Western states, that the federal government was giving it away for next to nothing. Thanks to the Homestead Act of 1862, settlers who made their homes on land and stayed there for at least five years could take ownership of up to 160 acres, all for the price of a small filing fee.
As for which states these forms work in, I definitely haven’t used them everywhere – but I have used them in a handful. The best way to verify their validity would be to contact a local title company and just send them both templates. As them, “If I get you the fully executed copies of these documents, will you be able to close the deal for me – or do you need to see something else?” This is usually a good way to test the waters before you actually go through the work of getting the contracts signed.
At the showing, make sure valuables and other confidential items are put away so the potential buyers are free to walk around. Try and keep the number of people in the house to a minimum. Give them some time and space to look around on their own, but be available for questions. Gather receipts for heating costs, taxes, past repairs, or renovations; buyers interested in the house will want to know these details.