The Bake Sale
The bake sale is the classic fund raiser. All you need to do is set up a table at the entrance to a dormitory or a classroom building, or outside a church or the school chapel after Sunday services and sell baked goods. It helps if the baked goods are freshly made; they almost always sell like "hot cakes" - pardon the pun. You could sell cupcakes, cakes, pies, or even candy apples in the same manner. An alternative way of doing this is to either buy the baked goods or to get a bakery to donate them to you.