if you don't know how to use a polisher don't go anywhere near you're car with one, you'll end up doing more damage than good.
if you've got deep swirls then, you'll have to find a company that does it, or someone on the forum near you that knows how to polish.
is it shine you're after? the meg 3 stage is good except stage 3 finishes with a polish. if you want a deep shine you'll need a glaze on top and then a pure wax on top of that. different people prefer different brands but you should be find with any of the big brands; megs, autoglym, clearkote, sonus, poorboys, collinite
i personally use collinite and would recommend it but my cars silver and the wax is mint for silver cars