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The package that each bit comes in will tell you what their purpose is. There are literally hundreds of bits that will fit into a Dremel. There are also multiple grits of sandpaper. Start with a low grit and work up to a higher grit for final sanding and finishing. Lower grit like 60 or 80 will take off rough edges then go up to 120 or higher for smoothing and final sanding before painting. You might also want to pick up a few sheets of emery cloth. It's just like sandpaper but has stronger backing paper. It's generally used for sanding metal surfaces. Emery cloth can generally be found in grits upto 800. That would give you an almost like glass finish.
Something you might also want to consider for the Dremal is an attachment that will make it work like a router. It will allow you to control the depth of your cut. It usually costs about $15. If Lowe's or Home Depot don't carry that attachment try Sears. That's where I got mine. When it's all said and done don't be surprised if spend a little closer to $100. Definitely shop around a little. Heck try Walmart they have a few power tools in their (hack cough) hardware section.
P.S. As an edit to my earlier post; try a few practice runs with your template and some scrap plywood so that you can get a feel for the tool before you start cutting on your case. You might want to make a second template to do this with. One template to practice with and one to do your final cut on the case.
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