The key to mastering coptic binding is to practice a lot, using whatever material you have at hand.
For this coptic bookbinding project, I used Japanese playing cards as covers and regular photocopy paper for the signatures.
In coptic binding, the middle stitches will be chains and the end stiches will be half-chains.
What I love about coptic binding is that the pages of the book open flat (which makes it perfect for jotting notes or sketching).
My books are the size of playing cards (less than 10 cm tall).
You can experiment with coptic binding on various sizes.
Here’s my first palm book featuring a photograph of Hedy Lamarr. You can hang the picture or you can tighten the string to store the book.