Develop a prototype: ShapeLock.com sells 10- and 20-ounce jars of plastic pellets that you can heat in the microwave and form into the shape of a gadget. If your first try doesn't pan out, put it back in the microwave. For more complicated designs, look for a machinist in the Yellow Pages, says Tamara Monosoff, author of Secrets of Millionaire Moms, who's sold thousands of her invention, TP Saver, which holds toilet paper in place so toddlers can't pull the roll off the rack. She also suggests logging on to Thomas.net, where you enter the materials you need for your product and it provides a list of factories that work with those components.
Find a workspace: Incubators let you rent space and equipment, from fax machines to industrial mixers, at a low cost. They usually require tenants to attend mentoring sessions, says Dinah Adkins, president of the National Business Incubation Association, "so, if you don't like to take advice, then an incubator is not a place for you." (To find one, go to NBIA.org.)