Some talking is normal - don't blow your cool every time a student whispers to her neighbor. They are just students, after all. Sometimes it works to stop and look at them until they quiet down. This is a lot more effective than screaming over them or at them. Understand the difference between punishment and discipline.
Punishment is for what they have done.
Discipline is molding them toward what they can become. Parents are your most important allies. When you say you will return from Six Flags at 11 p.m., do it. Parents need to see you consistently keep your word. Involve parents in all major decisions about the department.