Like previously mentioned, just get a meguiar's or a menzerna kit. Those two are the best polishes IMO as well as several other people.
Here is a picture of meguiar's for most to lease aggressive
Notice that Color X is not on that list. I do not know exactly how abrasive Color X is, but I don't believe it is that abrasive.
I know more about meguiar's than I do menzerna. So I will comment on Meguiar's and other might chime in about menzerna.
If you are going to get Meguiar's I would be M105 and M205. As you can see M105 is far more aggressive than M205.
So if you use M105 you will have to follow it with M205 as M105 causes hazing due to how abrasive the compound is.
Like I said earlier, always use the most abrasive compound first and then follow it with the least aggressive.
The best kit I saw that included M105 and M205 is
this one.
It comes with some 5.5 inch CCS pads which personally I am not too fond of. Some people like the CCS pads and some people like the flat pads. You might be able to ask for flat pads in the comment section when you order if you prefer those over the CCS pads.
Any pad you choose, I would prefer the 5.5 inch size as I feel it gives more cut since it is a smaller pad. That's the beauty of M105 and M205 you can dial in the aggressiveness of the cut by the size and type (color) of pad you use.
If you have any other questions let me know.