Print businesses will take a lot of your personal marketing and selling! Join as many groups as you can, and keep posting. Buyers will feel more comfortable purchasing from very active users.
Also be prepared to settle a lot of deals outside of your Etsy shop (or making private orders via etsy). Many orders will be custom quantities, color, cuts Etc - And it’s nearly impossible to make the perfect item exist for immediate purchases.
Sales will come in time, Just keep your name out there - even if its just to shoot the breeze. Be knowledgeable in print, know your color gamuts/profiles, cut size/bleeds/margins, stocks and papers, maybe even have a few vendors for outsourcing if needed - be versatile! And good Luck!