There are many good sources for information for writers. One of my favorite places that has a lot of useful tips is Kindlepreneur.com.
These are some of the articles that might be helpful to you:
Font Copyright Laws for Books: Your Print Book Could Be in Violation
https://kindlepreneur.com/how-to-write-a-childrens-book/How to Write a Children’s Book in 9 Easy Steps (2022)