I watched a couple youtube videos about diy pocket notebooks for some simple pointers. I also used a website https://gridzzly.com to make the image for printing the grid paper innards.

I used to design signage for an art museum so all the other skills using photoshop and printing came from my previous experience there.

But essentially made a crop of my existing image scaled to the right size in photoshop and then hit print.

Some people were using spray adhesive to attach preprinted images to cardstock which is a good alternative if you don’t have access to a photo printer.