In Flyff it will show you how to open a Private Shop if you go through the New Pang Tutorial, however, since I am going to assume that you didn't, open up the Start menu and click the Private Shop option in the menu. You can also set this to the slots on the bottom of your screen for ease of use.
You can drag items into the Private Shop and set their prices for whatever you want other players to pay for them once you have opened the Private Shop menu. Stackable items will also stack in here as high as they will in your inventory, and if you have a stack, you will set the price they pay per item, NOT PER STACK. When you are finished stocking up your store, click OK and when prompted to open the shop, accept the message that appears and your shop will be open.
Through the red/blue words above their heads you can denote people that have shops open. While your shop is open, you'll also have a chat dialog box. If people enter your shop, they may try to haggle prices, so make sure to watch it, especially if you asked people to leave offers written as L/O on the shop name, or M/O if you want offers mailed. You can also watch which people are entering, leaving, or buying things from your shop in the information tab.
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Author : ryokuichigara