Tell the students who you are, what your training is, and how they might contact you. Your office location, phone number, and office hours should be included. Topics, exams, and homework assignments should be prioritized so that students know what is important. A day by day class calendar, organized by your lecture topic, is a top notch way to let students know ahead of time what they will be doing. Regulations and operating procedures.
Every instructor operates class differently.
Some encourage class discussion, other instructors keep discussion to a minimum. Policies and procedures should be spelled out in detail in the syllabus. Spend time explaining to students exactly how you expect things to be run. Tell students what qualifies as an exception to a rule or procedure. Tell them the length of papers, how they will be prepared, word count, and all other criteria.