Print On Demand business requires you to design products and spend money on marketing, however, there are also ways to start the business and actually generate sales without spending any money. You can use free Generative AI tools to create designs, you just need to feed the tool with your prompts. Once your design is ready, you can join Amazon Merch, Redbubble, Zazzle, Teespring, etc, and list your product. Start promoting from your personal Facebook, Instagram and Tiktok.