You will need 1 sign and a chest. Place the chest where you would desire to open your shop. While holding a sign in your hand Shift+Right Click on the chest to place the sign. Fill out the sign with the information below. First Line: Write your username. You do not have to put anything here, if the shop is created successfully your name will automatically go on the sign. Second Line: This line indicates the number of items you are selling. Say you are trying to sell a stack of Stone, you would put 64 on this line. If you are trying to sell 16 Stone, you would put 16 on this line. Third Line: This line indicates the item that you're selling or purchasing from another player. (B: or S:) If you want to sell 64 Stone for $250, you would put B:250. If you want to purchase 64 Stone from another player for $125, you would put S:125. If you want to sell and purchase, you would put B:250 S:125. Fourth Line: This is the line that indicates the item that you are trying to sell. You can google "Minecraft Item ID's" (https://www.minecraftinfo.com/idlist.htm) In-Game you can do /iteminfo with the item you're trying to sell in your hand and it will come up Shop Chest ID in the public chat. If you use a name the plug-in does not reconize the sign will pop off and you will get an ERROR message in chat. If successful you will get a message in chat saying "[Chest Shop] Your shop has been created!" If you have any questions, please leave a comment below. I'll be happy to help.