Most security companies will pay minimum wage only and offer no benefits. This is one of the drawbacks to looking into security for a career and why most people will not stay in security for very long and get disgruntled. Your average contract security job is going to bring in less than 30,000$ a year
The best paying security jobs are Labour dispute exclusive companies and in house unionized security. Unionized in house security jobs usually require extensive training and positions only open up when a previous person retires and usually persons who get hired "know somebody" that will get them in. Labour dispute companies pay better but the work environment is often much more hazardous and stressful with few days off and much travel