Hi there milikan,
your brave to start offering polishing service with so little experience. I suggest that you practice on a scrap part before attacking your clients parts. When you do semi-truck parts you will need portable tools because normally parts are too big to handle. So I suggest flexible shaft or a industrial drill (12amp+) will do just fine.
Depending on the condition of the part
start with emery/spiral 8" x 1/4"stitch
then tripoli/spiral 8" x 1/2" stitch
finally blue moon/flannel 8" x 1" stitch
If the part is in good condition skip the emery step.
good luck.
P.S. hope you are not hangry about my first comment, I just don't want you to get in major trouble because of inexperience. One of my friend did the same thing like you and lost major money, he started to offer his service in polishing with little experience. And one day he got a antique job in polishing, he damage one part. Guest what the part was very rare, and the client decided to sue i'm... imagine. what a story.
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