All the ins and outs of making round holes, large and small, in tinplate are covered in this video. Check out http://www.tinplategirl.com for all the videos in this series, as well as lots of great projects that you can make!
NOTE: Clamps are the best way to hold your tinplate work to a backer piece while using a drill press. (The bit can easily catch the thin metal and become very dangerous.) Here are some basic ways to clamp your work to a drill press table: http://tinplategirl.com/2011/10/07/clamps-and-drill-presses/
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