Having a
DTG machine is such a HUGE advantage over others. You are able to print small runs for BIG profit. Put together a punchlist of what your machine has over screen and heat press methods and use the pros and cons. Then go out and MEET coffee shops, bars, lawn cares, mechanics, sports teams, the thoughts are endless. Hookup with sign companies that do graphics, their customers are always looking for shirts to go with their new lettered car, truck etc. Check with car clubs too.
Follow up your talks with a phone call and give a recent special you are running. I have aDTG and use myspace, craigslist and meet people waiting in line at the store. Market mraket market what your machine CAN do over the others. Good luck.