Writing the post orders and standard operating procedures is a technical skill. Contract security firms that are able to use a technical writer to support this work will have an advantage over those companies that do not.
Campuses and their contract security providers must work together to develop appropriate post orders and manuals so security operations run smoothly.
To find the right person or organization for your project, check references, create a good request for proposal and learn whether or not they will be contracting out some of the work.