Once you have a selection of T-shirts to sell, you may post them on the Internet, sell them at consignment shops or even set up tables at fairs, flea markets and bazaars. Step 1. Decide which type of T-shirts you want to sell from home.For example, you may sell T-shirts with funny or inspirational messages. You may even offer to put custom messages and designs on your T-shirts. Step 2. Contract with a silk screen business to print the messages on your T-shirts.nce you have a selection of T-shirts to sell, you may post them on the Internet, sell them at consignment shops or even set up tables at fairs, flea markets and bazaars. Step 1. Decide which type of T-shirts you want to sell from home.