If you make something under your brand, you need product liability insurance. A commercial insurance company should be able to help you with this quote for your project, plus it’s a good idea to have a commercial liability attorney make sure you have the needed coverage based on overall sales. I’d call a local college and see if their law program can give you some advice since this is an assignment, not a real company. And a commercial insurance agent would probably be willing to give you some ballpark figures for your data. Good luck!