Just pull a student aside and communicate your behavior expectations and provide the student with an opportunity to respond.
Relocate the student to another teacher's classroom for a time out.
Yes, I agree--it sounds like just something else that you have to do. You, as the teacher, should work closely with the parents to specifically identify what the expectation is for each behavior.
So too, the privileges and consequences associated with the contract must be specific.
After all, you are placing a misbehaving student in his or her class.
With that in mind, always provide work for the student to complete while in the other teacher's class.
If not, you may be able to schedule a conference with the counselor.
Additionally, if students were misbehaving in class, parents could request that teachers indicate that in their planners.
Standing near a student who is off-task or asking a student a clarifying question can serve as effective types of redirection.
I have found that the best way to carry out this step is to schedule a quick meeting after class with the student, before he or she goes to the next class.