I attended a Classroom Management workshop where I learned two magic words that have the power to save a first-year teacher: Procedures and Routines.
You have a procedure for everything--how to enter a classroom, how to pass in papers, how to properly head a paper. Then, you rehearse those procedures until they become routines. The result: Better management = less discipline = more learning.
When Ralphie isn't following procedure, I am to quietly make eye contact and ask him," Ralphie, what is our procedure for...?" If he doesn't know, I restate it. If he knows, he tells me and I say, "Now, show me." He rehearses the procedure until he gets it right. (For example, re-entering the classroom properly) Classroom rules are clearly visible, as are consequences for choosing to break a rule. Procedures are for doing things and don't have punishments attached, rules are for conduct and have consequences for choosing not to follow them.
As a paraprofessional I saw to it that the students followed the procedures taught by my teacher until they became routines. As a new teacher, I am now responsible to establish those procedures as well as to see that the students follow them. There's a big difference.
Procedures and Routines -- magic words!