<unsolicited public advice without listening or asking questions because im a git> Sales is two things: good product and having/inventing a plausible/worthwhile excuse to mention it.

No one has to be an artist (the best I can do is about the 2nd grade level: stick figures and writing which gradually changes size and slants to one side.). There are plenty of really good designers in most major metros whom will work for some % of gross, credit and/or fee... Dribbble, 99designs, sortfolio, elance, odesk, craigslist, on and on. See what folks can come up with and do small test runs to see if it's worth stocking (Amazon fulfillment will hold stock for cheap). Zazzle typically makes bank at a high price-point and leaves you with a pittance %. Indie graphics shops can usually make quality shirts at various volumes for super cheap, some will drop ship directly to customers and others can send to Amazon Fulfillment and let Amazon handle it.

Also for shwag concepts, it's possible to crowdsource ideas & voting from a massive community (creds on actual product)... It's a plus for at least 3 reasons.

Promoting: vlogging YT, podcast interviewing people, conference and meetups, so on... Always bring more value and humanity to an event or forum than just pitching sales robot, that's what people respond to usually

</unsolicited public advice without listening or asking questions because im a git>