To add to Parchessey's great comment, you're going to need to bake a lot of cakes. Some cakes are going be big winners and some are not. A pastry bag with an assortment of decorating tubes will be a necessity, as will cake pans of different shapes and sizes. The trick will be finding the perfect frosting, icing, or fondant to decorate with. Reading books and taking classes will help, but experience will be the better teacher. Good Luck!