I required a CDL Commercial Driver's License to legally operate a school bus, nearly identical to OP. I additionally had to have "Passenger Endorsement" to tra

I required a CDL Commercial Driver's License to legally operate a school bus, nearly identical to OP. I additionally had to have "Passenger Endorsement" to transport passengers (not sure limits on number and relation, like I'm fairly sure I could transport my sister w/o PE). PE also lets me operate limo/cab. There are HazMat and a couple other endorsements. A higher class of CDL is required to operate tractor-trailers, aka semi's. My employer provided training and I had to pass written and operating/driving tests in addition to medical exam/requirements. This was in Washington state. Similar in the several other states I have lived.