Hi from Michigan. I take it you want a basic postcard where the image and the numbers you marked can be changed. I'm not sure if you want to have this as a PDF to print, but I assume that is the goal. I have a portfolio here on Freelancer, I also worked for Domino's Pizza (HQ here in Ann Arbor, MI) developing their post card and direct marketing automation software. Anyway, I would write a stand-alone (Mac or Windows) solution that would take your basic postcard and let you insert photos and text for each run. I've done this before for Print-On-Demand projects.
Thanks Eric