You might not remember your own experience very well, but the transition into middle school can be a terrifying experience for a child. In many schools, this will mean a more open class structure or having to use lockers and get to classes on time.
Before the term starts, you should attend a tour of the school with your child. You'll be able to learn about scheduled break times, find classrooms and start organizing a routine. If he is taking a new bus to school, it might be helpful to walk the route with him and help him memorize the bus number.
It's not all logistics, though. Your child will be getting used to new and different peers in addition to dealing with a wide range of new courses and material. Also, he'll likely find himself with more social demands and having to balance complex homework assignments. As a parent, you should be involved: Make sure you've met the teachers and that you have access to a course guide so you know what to expect throughout the year. Doing so will help you help your child as he finds his way among new friends, group homework projects and new obligations.