Figure out how big you want your lure to be. Muskie action? Pike? Or maybe some largemouth bass? Big lures equal big fish....most of the time. I went for average size, about 3 Inches.
I don't have a lathe (yet!) so i had to do this the old fashioned way: whittling. I made it easier by cutting off the 4 corners of the rectangular block, lengthwise (see above pictures) to thin out the lure.
I decided to go for a cigar-shaped topwater lure, so I whittled the ends cone-shaped.
A lathe would be much faster, and you could make dozens of blanks, of various shapes and sizes. I plan to do this very soon as winter is approaching!