Get a 5" backing plate and 5.5" pads. Lake country sells both.
Lake country flat pads in the above colors are great. Autogeek sells a 6 pack. If you want to wax by machine then I would go 2 orange, 3 white and 1 black. If you wax by hand then go 3 orange and 3 white. I just got done testing out the new hydro tech pads which are nice.
Don't forget a pad conditioning brush to clean your pads as you go. Keeping the pad clean is key.