Chest shops:
To make a chest shop get a sign, chest and what you wish to sell in it, put your name on the first line, if it doesn't fit, leave it blank, on the second line type the amount of the item you are selling, on the third line type how much you want to sell/buy it for. So if I typed B 5:2 S people can buy it for £5 and sell it for £2. if I typed B 5 they can only buy it for £5. remember to place the relevant items in your chest.
If there are tutorials you think that should be added please contact newo88.