How can I know if my business idea is demanded by the market, besides asking my friends and family?
Beta test it to a larger market such as doing a limited online offering to your target customer at the price you are needing/wanting to sell it at and see the response. Do a direct mail marketing campaign using a temporary phone number if needed to gauge the response. Offer your products at a farmers market or community garage sale. You just need to get a larger audience to give you feedback.