If you are a good designer, you can have this business to start right away. Selling t-shirts with your art words or anything else printed on them is a great way to exercise your creativity and make money. Though it can make you a small profit at least there is something you can add to your extra income. This is how to start your t-shirt design business: 1. Figure out why you need a shirt 2. Define your budget and quantity 3. Know your printing options 4. Brainstorm your design concept 5. Find a designer 6. Evaluate your design 7. Get the right files from your designer and 8. Find a kick-ass printer.