This year at GenCon, I had the pleasure of teaching six sculpting classes and meeting nearly 40 people who share my enthusiasm for creating miniature toy soldiers. The majority of the classes focused on basic elements that can be tricky when sculpting your first miniature. By far the most important is making a proportionate armature.
With that being said, and as promised to my students, here is an image of the measurements for making a typical 35mm miniature.
Good luck and keep sculpting!