Please, please, please, please do not embark on what you are about to without going to a true high-end detailer's shop to see what your results should be, and do not buy a POS Hack & Decker rotary. Take a look at this video please:
Detailing is an art. You have to be deft with what you are working on, and what you want to achieve. And I think Meguiar's should be beat to death for its ScratchX product and how they market it; they make it sound so easy—it's not. I would simply wash, clay, and wax for now. Learn a bit more about detailing before you ever take a machine to your car.