Working with fondant and detailed cakes?!
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You can buy the shape cutters at the craft store, in the cake decorating aisle. Also buy some gel icing colors, Americolor if they have it, or Wilton if that's all you can find.
It's easier to cover a round cake with fondant than a square cake. You need frosting underneath, either buttercream or ganache. The frosting makes it look smoother, helps the fondant stick, and provides the texture that we're used to on a cake.
You're going to need a rolling pin, corn starch and a pastry brush, and a good-sized mat for rolling the fondant on. I use clear vinyl from the fabric store as a work mat. It's cheap and works well. You have to store it rolled up though, if you fold it, it will get wrinkles.
To attach fondant cutouts to a fondant-covered cake, brush the backs of the cutouts with a very tiny amount of water and put them on the cake. If they're on the side, you may need to hold it in place a couple seconds while it dries.
You can use cookie cutters to cut the shapes out of the fondant. It's best to ice any shape or style cake before placing the shapes on, that way they'll stick. I have found rolled fondant in the party supplies section at walmart. Have fun!
I don't think fondant will be beneficial, use regular frosting