Suggest you find a way to vet the people who will be coming to your house. Putting out a public notice (such as an online post or a sign/flyer at your local train store) will lead to anyone and everyone showing up. Keeping an eye on everyone, keeping track of what has been sold, making sure that nothing walks away (including non-train stuff), and the possibility of people scoping out the contents of your house - no thanks, IMO.
Why not start by inviting the members of your train club?