Hi My Little Angel, I was just on your Facebook page. Thank you for posting on my wall. I will post on yours, too. Your cakes are truly stunning.
You can do consignment one of two ways. Either set your wholesale price, and the store will then create their own retail price. (The retail price is usually 2 or 2.5 x the wholesale price.) The store will pay you your wholesale price when the item sells. Or, you set the retail price and the store will pay you a percentage when the item sells. Typically around 50%.
Consignment requires very careful record keeping. Create something like an invoice that shows the item description, and the price you are to be paid. Create a copy for yourself and give the store a copy. Have the shopkeeper sign your copy. Then touch back every few weeks to see what's up. If items don't sell, you just take them away -- no strings attached for anyone.
Good luck!