Good luck! As a NQT, the first step towards excellence is to acknowledge that you too are only human. Be yourself. Of course, enlisting the help of school leaders is tough because you will find yourself comparing their methods with your own.
Standards can be subtly raised once the habit has been established. It is your classroom and you must actively and consciously make the rules and decisions, rather than letting them happen out of habit, poor organisation or at the whim of students. If they are stuck, the work is too hard. Students misbehave for a variety of reasons — some complex, some simple — but never because you make them misbehave.