I was wondering if anyone knows how to create custom notepads with custom pages?

For a deeper explanation

I want to have custom math school book for next year to study in, and I made a crude template of how I want the inside pages to look (Below)

Do you have any websites or tips on how I could make a custom notepad? Because there are a lot of websites and ways to make custom front/back covers, but not really pages on the inside.