I wanna make a shop where I can sell houses, but I don't understand how to make one, as I've seen one in RoCitizens. It looked pretty easy, but when it comes to doing it it's not that easy. So I need your help!
This wiki page gives a good example of how to make a Dialog shop, I recommend playing with what this gives you and build upon it.
http://wiki.roblox.com/index.php?title=Dialog_Shop_Tutorial