After I pick my favourite thumbnails, I take a picture of them and upload them to my computer. My sketches are so rough I try to get these digitally drawn over as soon as possible so I don’t forget what I was trying to draw, lol.
Once my digital sketches are together, I put them in a ‘dummy’. I just print out my sketches and glue the pages together like we did in elementary school.
It’s still all rough, and the text is just stuck in, but I can double check that the page turns work and the spreads flow: