Speak to an attorney who specializes in food businesses in your state to get a list of the legal requirements. Your state and local food/agriculture departments will have information for you, too. You'll have to pass health inspections, meet possible zoning restrictions, and will have FDA regulations involved.
Don't forget the need to incorporate, obtain a sales tax license and obtain insurance. In short, don't move forward on this idea without the benefit of professional advice from people who actually speak to you about your particular situation.
Nina L. Kaufman, Esq. is an award-winning New York City attorney, edutainer and author. Under her Ask The Business Lawyer brand, she reaches thousands of entrepreneurs and small business owners with her legal services, professional speaking, information products, and LexAppeal weekly ezine. She also writes the Making It Legal blog.