Seek the support of a campus department or office. Your institution may already have a Safe Zone program. If so, enlist the help of its coordinators to help you get started. Someone there should be able to help. Talk to the Greek advisor as well.
Many institutions have their Safe Zone information on the web.
Some well-placed phone calls to other institutions could help. The Lambda 10 Project also has developed a Greek Safe Zone Ally program with a set of resources specifically designed for college Greeks on any campus. Decide on a method of delivery. At my institution we decided that no one could post the Safe Zone symbol until they went through some training. We offer two-hour sessions to faculty, staff, and students throughout the school year.