Types of Commercial Licenses
Class A--Commercial Driver License
Any combination of vehicles with a GCWR--Gross Combination Weight Rating ) of 26,001 pounds or more provided the GVWR of the vehicle(s) being towed is in excess of 10,000 pounds.
Class B--Commercial Driver License
Class C--Commercial Driver License
CDL Driver: U.S. Citizenship or Legal Presence Documentation Required.
Refer to this documentation
https://www.michigan.gov/sos/0,4670,7-127-1627_8669_53324-366247--,00.html
General Questions about Commercial Driver License
https://www.michigan.gov/sos/0,4670,7-127-5647_12539_71014---,00.html
If you don't have any Driver License and wants to know for requirements how to obtain an operator refer to this document of Secretary of State Office
https://www.michigan.gov/documents/DE40_032001_20459_7.pdf