How can I make a plan to prevent school violence?

According to the National Association of School Psychologists (see the link to their site below), one vital component of programs to prevent school violence is to "create a safe, supportive school climate." In order to do so, students have to be made aware of behavioral expectations, and there must be a caring school climate with psychological services available to students. Therefore, one critical part of preventing school violence is to make sure students know how they are expected to behave and to establish clear school norms for behavior. In addition, students who are experiencing psychological or other issues have to have resources, such as counseling, at their disposal.
Students also play a large part in keeping schools safe and preventing violence by reporting any infractions in school rules to teachers and administrators. In addition, students should be involved in using peer pressure to help other students follow rules and act in a non-violent manner. Students should be involved in helping to come up with plans to keep their schools safe, and they should feel that preventing violence is their job as well as that of teachers and administrators. To this end, there should be clear mechanisms by which students can report violence or the threat of violence to adults, such as hotlines or other systems. Finally, students and teachers need to rehearse safety drills in advance so that they are clear about what they need to do in different types of situations (for example, whether they should evacuate or stay in place with doors locked) if violence erupts either outside or inside their school.