I'd suggest starting out with CMA's backing plate and starter kit.
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http://store4.yimg.com/I/classic-motoring_1681_1977205
For SMR start with the white. If that isn't provideing enough bite go for the yellow pad or the white pad with FI II.
For AIO I've used both the white and yellow pad. Both work well but the cutting pad provides more cutting action.
I got a brand new PC and the Klasse system at the same time. I use the PC with the AIO and was very pleased with the results THEN I made a big mistake and used the PC for my first ever application of SG. I used the grey pad and way too much product. Only I didn't know it was way too much. It didn't appear, to my untrained eye, to be too much. When it came time to buff though egads my arms nearly fell off from the buffing and the couple of Viper bonnets I bought quickly gummed up when buffing the SG off.
So I came back here and did some research and asked some questions and began to climb the learning curve for working with SG. After using SG several times I decided to go back and try it again with the PC. It did work much better than the first go around with the PC however, I still feel that SG works best when applied by hand using a MF applicator. I spray one or two shots of QD on the applicator to moisten it then I use the SG sparingly. Three thin one inch lines of SG on the applicator will do an average hood.
CA typically has low humidity so I can usually get away with letting the SG sit for 20-30 minutes before buffing however if you have the time and a garage let it sit longer.
Then when I buff it off I use a MFT that has been soaked in water and thoroughly wrung out to make the first pass. Then I follow that with a dry MFT. The combination of the thin hand applied coats and the damp MFT make SG a real breeze to work with but it took me awhile to get to this point.