Rules should be established as a part of the structured plan. Be careful that all rules are meaningful and purposeful. As with any child, rules need to be expressed and enforced with consistency. The environment for managing destructive misbehavior must have a wealth of love and praise. Remember that the underlying factors for the misbehavior are lack of self-esteem, revenge, and power.
Active love can go a long way to help eliminate and heal the inadequacies that feed the misbehavior.