I was thinking about opening a shop. So I did. I Put chests everywhere wasted wood know it wont let me create a shop.

 

You have to place a sign above or on the chest that is formatted as following:

Line One: (Your In Game Name)
Line Two: Amount per sale
Line Three: B(PriceHere) *Optional: Try B(Number):S(Number) to allow your shop to buy and sell items
Line Four: Item name/Id

For example,

BlueberryWaffle7
2
B25:S15
Chicken

This would allow you to create a shop that would sell 2 chicken for 25$ and buy chicken from players for 15$

Hope this helped :P

 

This^^