you need to buy a bullitin board off a NPC housing merchant, then place the bullitin board in your house and click on it. you will see tabs in the new window. the middle tab is sell tab click it. in the black squares you need to place a box or sales crate by draggign and droppign it into the black square. fill the boxes via drag n drop aswell. IF the box is a sales crate you can R-Click it and place a sales display in your house, ppl can then buy from it while your off line.
you can also access your store via a broker and load it with goods to sell but you cant place the display unless in your home.
-Gaffeny Gandersprocket, Oasis-