Most often, when we think of turning a hobby into a business, we think of making and selling items. This is the most natural course and many people are engaged in this business. Products may be marketed at fairs, retail stores, through mail order, and on the internet. If your hobby doesn't involve producing an item, or if you would like to expand your business, then try these ideas. Sell items related to your hobby.
Most hobbies require some special equipment or supplies.
Find sources for these supplies and make your own catalog of specialty items. Teach your hobby to others. There are many places you can teach your classes, such as, retail stores related to your hobby or at community universities. A variety of courses may be offered from beginning to advanced levels. A good subject for a short class is to demonstrate how to use the tools and supplies.