Spend the first week of school working on procedures and routines. Scale everything down to practice walking together in the hall, where to find the bathroom, how to put books back on the shelf, and where folders go. I always say it's okay if the first week of school is a little more boring than the rest. Practicing these will help children know what is expected and how the classroom environment works. Taking the time for procedures in the first few weeks of school allows more flexibility as the school year progresses.