I created a binder with a section for each class period. Each period is divided by a labeled and laminated page. When you go to each hour you will see a seating chart with photos of the students. Following this I have my attendance sheet with space to mark if a student leaves to go to their locker or office...or wherever. It helps me keep better track of who is going where, how often, etc.
I also have binders for a sub, and another for discipline.