This is a great kit if you're on a budget & want high quality.
Porter Cable 7424XP or
This
It really depends on your budget, but the basics should be a medium pad to remove the swirls and a fine pad to finish. You're really only choosing the compound you want to go with. I use Adam's Polishes is great and more recently Meguire's M105 & M205 which is also great.
Here's a list of the basics:
-Polisher, obviously
-Pads
-clay bar
-detail spray
-microfiber towels (quality ones, not the cheap stuff at autozone and walmart)
-Polish of your choice
-Wax of your choice
Or this kit with the Groits 6" and Megs M105/M205 combo.
Use the discount codes to save yourself a few bucks.