Well there are sites which let you to submit your design and they will print it to T-shirts, cups.. all kind of stuff. All you would have to do is find people to buy the stuff, lead them to your e-shop and everything else from printing to shipping will be taken care for you.
If you print design yourself and want to do everything 100% too then I would suggest to get more designs, like 15-20 and then start making these. Set up a simple e-shop script and start a shop.
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