Most people know how ChestShop works but there are some players who don't. Well, if you are one of those people, then you are on the correct thread.

So, for example, let's say you want to sell 64 Cobblestone for $20. All you have to do is:

1) Place a chest down and put in your items that you want to sell (in this case, we are selling Cobblestone)
2)Then, place a sign above or next to the chest and enter this on the sign

1 - BLANK
2 - 64
3 - B 20
4 - 4 (COBBLESTONE ID)​

If you need item ID's, here is a good website: Minecraft ID List
3)Click 'Done' to finish editing your sign and you are done! When people visit your warp, they can buy your cobblestone even if you're not there!

Hope this helped,
-TheDruid