1. Place a chest on the ground
2. Hit the chest with the item you want to trade (in survival mode)
3. Type in price for the item (As prompted) in chat
4. Fill the chest with the items you wish to sell

Right-click the sign on the chest and a chat-ui for Control Panel will open for you, just click the text and shop will setup.

Shop Staffs and more features usually made by command system, execute command /qs help to check the commands.
The commands will hide if you didn't have permission to use.

1. Find a shop
2. Hit / Left click the shop
3. Enter the amount you wish to trade in chat

Staff can help you manage your shop in game, they can open your chest, set price, toggle selling and buying. But staff can't remove your shop, get money from your shop trades.

/qs staff add

/qs staff del

/qs staff clear

/qs staff list