At what point does one need a business license? I want to test out selling duck manure and water on places like craigslist and facebook, but I wasn't sure of the legalities. Can I test it out first to see if the market is even good enough? Can I put a label on it? or would it then really be classified as a business? I've been googling like crazy, but I'm still not certain and hoped there might be someone with experience here. Thank you.