Print on demand business is a business model where you customize your design on different products and sell your designs as product print. To generate sales your designs should stand out. Use a blend of text, images, and other graphics in your designs. Also try to tap into the current trends. For instance, you can create Christmas themed design if holiday season is near. You can also create design that cater to particular group of people. For example, you can use rainbow color and designs to attract LGBTQ, or cat themed designs to attract cat lovers. You can use photoshop or Canva to create designs for your products