Know them and always have some flyers at your house on the sign and with yourself. Listen to people and ask questions. It gets people thinking and talking and starts a good rapport. Always have your home in tip-top shape. We discussed home preparation in another area and cannot stress this enough.
Weekends are big for a lot of people for looking at houses.
Make sure the house looks good for the whole weekend. You may need to help them with the basic idea of writing a residential purchase contract. You should have some at your house on hand. There are great books available about the whole FSBO process. You may want to have some books or legal guides on hand.