These folders are to practice skills and gain fluency of letters, words, numbers, reading, and writing in Kindergarten. These are the front pages to include and share with parents the expectations for the year. It also includes word lists. You may need to tweak things to fit your specific school, but you need something in the front of the folders to share your expectation and guidelines.
I usually print these on a different color and leave them in the front of the folder even when I change out the pages in the back. I like to put in a 9 weeks worth at a time if I have copies available. You could just put in 2 or 3 weeks worth at a time. It's really up to you and your teaching style. I like to keep several weeks work in the notebook as it gives parents a chance to see what's coming. I use these in my small group directed reading time to begin the week and then trade out other activities according to that groups abilities.