The first step is to determine if there's a need for your product. If you're creating something that no one has seen before, it's important to do some research and find out if people want it. Once you've established that there is a market for your product, you can start researching companies like Printify or Printly that will help you get your business up and running.  Before you sign up with a print-on-demand company, make sure that they offer what you need and have good customer service reviews. After picking a POD provider, you can start creating your product and uploading it to your store. Once you have everything set up, start marketing your store and get orders flowing in.