If you want to create a store on the server Minecraft PE then you would need a plugin EconomyShop, with its help you can create a simple but functional shop where you can sell any items.
How does the plugin work? The plugin works through the normal plaques. Take the tablet in hand and put in any convenient place, in the first line write "shop" on the next line enter the price, such as 500, the third line, specify the ID of the item you would like to sell, and in the last line specify the number of items that will get the player clicking the sign. As you can see to sell any item with plugin EconomyShop Minecraft PE very easy and only takes a few seconds, the main thing to know item ID, you can see them here or use the mod PocketInvEditor. In order to remove from sale, simply destroy the sign. Review: