State rules clearly . Putting one toe over the line would mean being out of the area. Provide students with a hierarchy of consequences , both positive and negative. Compliance means rewards.
Noncompliance means punishments.
Be as good as your word . Don't get mad and send the student to the chair after two talk-outs. Don't let six go by before responding. Don't promise rewards or punishments that are not possible. Only demand behavior that can be enforced .