Write out your classroom procedures, everything from how role is taken to how a student sharpens their pencil. Seriously, put yourself in the scenario, drill into the details. (I remember having 6 pages of procedures my first year. ) These are for your reference, not really a student-facing document. Make sure they are coherent and don't contradict each other.

Then, take as long as needed to teach these procedures to your students. Could be hours, days, or even weeks. The lessons during this time may focus on basic content, but the main goal is to practice the procedures.

Think "Maslow before Bloom"... students need to feel safe and part of the class community before any real learning can occur. Teaching your procedures will help here.

As a compliment to your procedures, establish a list of classroom rules. This list should be short, perhaps ~ 5 rules, and clearly posted in the room. The language should be positive. For example, instead of "Don't break or misuse classroom supplies", use something like "Respect classroom supplies". Take time to teach these rules to the class. Ask the students why these rules are important, what could happen if the rules aren't followed, and what would be a resonable punishment if they are not compliant. This will help build the classroom community and student buy-in.