It seems to me that if you don't start working with programs, then all your knowledge is theoretical and you still need to practice it to achieve some result. I know it can be difficult, but you have so many articles, tutorials (even with videos), tools and free mockups like this https://www.ls.graphics/free-mockups/postcard-mockup at your disposal that you can't help but get started. It can be difficult at first, but if you will not be working in Illustrator or Photoshop, then you will not be a graphic designer. I advise you to come up with some kind of mockup, for example postcard and start working on your unique design. Don't worry that the first version of your postcard will not be very good, you will correct this soon.
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