You're very welcome - I'm always happy to help. Feel free to PM me anytime.
The best book I've found on behaviour management for high school level is Why Are You Shouting At Us? by Phil Beadle and John Murphy. They're from the UK and have a really practical approach to behaviour management. It's my go-to gift for new teachers.
Each school has its own behaviour management system. I was lucky when I student taught because I was in an RTP (responsible thinking process) school and received some great PD from a deputy on how to use the process effectively. It's definitely worth asking someone from admin to walk you through the behaviour management policies and processes once you are put in contact with your prac school.
Students want consistency - when you know what to expect, and what consequences are, you know what you should be doing and that is comforting. If there's a process in place at your prac school, work within it. If there's no overarching plan, talk to your supervising teacher/s about what they do. If they don't have a good plan, feel free to PM me and I'll send you ideas for classroom expectations/rules, processes for when students disrupt, reflection forms to use as part of your behaviour management process etc. If you want to read up on theory, look into the Responsible Thinking Process (based on Perceptual Control Theory) and Restorative Practices/Justice.
Again, don't hesitate to PM anytime. Good luck with your DipEd!