i started with 3 different designs and actually printed on t-shirt (1 funky, 1 religious type, 1 kid oriented....targeted for these 3 markets)....and
20 different designs just printed on a bond paper binded on a folder just for visual aid of what i can print.
people normally asks "can i see the quality of the prints?" then you can show the printed t-shirt......"do you have other designs?".. then you can show the ones you printed on bond paper.....and hoping the next question will be "How much?"
