I filled out an application in the dispatch office. It was a basic application. They asked for a copy of my drivers license and that was it.
About a week later I received a call to come in for an in person interview with the Safety Department. I already had my Class B license so I was able to cut through a lot of stuff. I was given paperwork to get my fingerprints (background check) as well as my DOT physical (yes, you need to get another one beyond the one for your license). It didn't cost me anything and I was able to get it done within a few days.
About 2 weeks later I was given a summer school run and that was that. I now have a regular school year route and I couldn't be happier.