Schools hire their own people. Those people are state employees usually in a public school. As far as churches go, they usually have volunteers who are in the Police Dept or something to do their security and retail well that is a different story, you can try that out.I once worked for a large security company and they hired a lot of ex policemen for the administrative part and getting contracts. See if you can gather some retired police and military and get your business started.Best Wishes!
security guard is the lazyest job i know.licencing first
Look into a franchise. It is way to risky to go out on your own.