Make sure that you communicate with your team about discipline so they can support you if there are issues. Utilize the "buddy system" also; this should be even easier this year now that all team mates are next door to each other. And remember, parents are your friend!
And remember to utilize your counselors. We can help with some discipline issues before they become to the point of a referral. And, of course, the peer mediation process. As we all know what the drama is like in middle school. Hopefully our peer mediation program can work well this year.