The four rules I would have posted visibly in my classroom and draw students’ attention to daily would be:
1) Treat yourself and others with respect at all times. (Rules of Respect (SAT): Space, Action, Tone)
2) Come to class prepared with homework, materials needed for the lesson, and a positive attitude.
3) Follow the three Ls (Look, Listen, Learn) when someone else is speaking.
4) Help and encourage each other to succeed.
I would call on students to work together as a community to decide on specific procedures and ways of remembering how to meet the behavioral expectations of each of these rules on the first day of class.
A website that I found helpful was an article about classroom management published by the American Psychological Association: https://www.apa.org/education/k12/classroom-mgmt.aspx
Here is a link to an image of my wordle: