One suggestion (and maybe you’re already doing this) is to do test cards without committing to a full project. I’ve done lots of test cards in various styles, media and card sizes. I’ve also scanned and even test printed some to see what they would look like. If you want to eventually have your deck printed, it’s nice to learn more about how different papers, different pencils and colors (etc) work as a finished product. And it gets you going, which helps to give further ideas and inspiration! (If you don’t want to invest the money in printing test cards professionally, then you can print them with a home printer. It works great too). Best of luck with everything, and don’t feel pressured to show us your artwork, it’s nice just to read your thoughts on the process!