First will be usual interview with HR, asking major responsibilities and previous experience and availability. Then, unpaid information Orientation about fire alarm, water leaks and shirt mcqs to solve. Later, short of interview about salary expectation and sites available and why you want to do this job. Uniform and documentation. Choose training site and get started.
Interview must be one by one. Should check IQ. And how he behave attitude of a person security exp.
Remember to ask for your $50 signing bonus Visa Card after orientation. They'll often "forget" to mention it.