"Cold weather gear," in most cases, is just a case of adding another insulation layer or two (plus warm hat and gloves) to what you already have. Since you live in Iowa, you undoubtedly already have what you need in your closet! You can greatly increase the warmth of a sleeping bag by wearing warm clothing inside.

Look for local classes in map-and-compass navigation to get started on that important skill. You may be able to find orienteering groups in your neighborhood, which will combine the skills you need with fun for the whole family.