To have held a regular driver's license previously, minimum age of 18 (21 for interstate operations), be able to pass the tests, be able to pass the DOT physical exam.
I believe that the requirements for a class B commercial drivers license varies from state to state. Your best bet would be to check in the state where you live and contact the DMV to find out what the requirements are and where you can go to fulfill those requirements.
They are federally regulated, so the testing requirements are uniform.
Yes.
No
No.
Yes
Yes
A valid drivers license and a DOT medical card.
You need to have a high school diploma or GED. You also need to have a clean driving record. You will need to get your commercial driver's license. Each state does have specific requirements in order to get a commercial truck driver's license.
Commercial Drivers Licence, Restricted Drivers Licence
A commercial drivers license or CDL is required to drive semi trucks, tractor trailers, and eighteen-wheelers. Most companies will require a minimum amount of experience or graduation from a truck driving school. Each state has slightly different requirements for their CDL so make sure you check your own state's requirements.
To get a commercial drivers license, unfortunately for you, you must be 21 years old. It seems you have a while to wait, but maybe you can work on a career plan while you are waiting.