Sanding a Polyester (Plastic) ball is not particularly any different than sanding any other ball, other than it takes a little longer to do because the material is harder than other balls.
You use the same grits, typically you don't skip grits though since plastic balls usually have a "Polished" O.O.B. So you want to do each individual step so you have the smoothest surface.
As for what grit you start with, that would all depend on how bad the balls surface is. If it's dinged and scratched up real bad, then you'd start with a course grit, If not then start with a finer grit.
As for using polish, it's all personal preference. Some like a little sheen, some want it to shine like a marble and polish away, if you don't want to use polish you can have a good shine using nothing but pad/paper.
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