Cupcakes & Baking Supplies

My cupcake comes out bubbly like with holes in it. It also over flows sometimes. What am i doing wrong? Also the frosting usually leaks out the whole when loading in the frosting, is it supposed to be really thick? Oh can you use easy bake oven packages with it?
its my sisters, and i like making the cupcakes in the maker. can you guys just cut the criticism and give some help

Image taken on 2009-03-30 10:04:59 by Cupcake Sisters (Senel).

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