Check your local community college or other centers in your area that might want to offer sewing classes. Decide on the optimum number of students and the level or type of classes you will teach -- for instance, "Sewing for Beginners," or specialty classes, such as quilting or embroidery.
Develop a business plan. Some local government centers offer free or low-cost business start-up courses. You may find such a course useful, if you do not have business experience. Decide on a venue; you may choose to work in your own home, or in a local school or community center. Purchase a business liability insurance policy, if you work at home. If you teach at another venue, inquire about insurance from the venue organizer.
Contact your local city or county government office, and ask if you need a business license. Maintain business records from day one, so that your books and tax records are complete.
Advertise your business. Put fliers in appropriate places and place an ad in your local paper. Word-of-mouth advertisement can work well, too. Tell your prospective pupils in the advertisement about the cost of the classes and whether you supply the sewing machines or they bring their own.