Each student should have a class job. There are 24 listed in this document, with room for you to ad 3 more. In my room, I mount these on a large posterboard near the door, then make velcro stickers of each student's picture in the class so that it is easily visible who has which responsibility. I rotate them through the jobs once a week.
If you like this, I have a matching Classroom Decorations Bundle. Please check it out in my store :)