Every year I have all my students come up with their own rules for the classroom. I know you thinking OH NO! but it works out to my advantage.
1.) I explain to them I am going to let them come up with the classroom rules and remind them to keep it appropriate.
2.) Pass out post-it-notes to allow them to write their rule on.
3.) After they are done writing their rules I allow share my three rules first. I explain to them that I want them to post their rule where it fits. Example: No food or drinks in the classroom----> Classroom Environment.