Dale,
with regard to products to use with your new PC - I'm a recent PC owner too, so far I have tried the following products with it - Autoglym Super Resin Polish with the green (DAS) pad. This seems to work really well although you use more product than you would think. D3mon is right though - even though there is a mild 'cut' to SRP, it still won't tackle anything other than the smallest (almost invisible) scratch as it is too mild. It does go on well with the PC, spreads thin, you can see where you have been with it and it is easy to remove. Makes a good surface for any sealant / wax you might want to apply.
I have also applied Wolfgang sealant with the Blue pad - which I also recomend - again easy to apply with the PC, goes on thin, wait until dry and wipe off with an MF cloth. I did try Autoglym Extra Gloss Protection with the MF bonnet over an orange pad (as suggested in the instructions with the PC) - which was OK, but hard to control and probably (unless you have a really big car) easier to apply by hand.
I have tried applying #16 with the blue pad and it goes on well - it heats the pad up and seems to spread #16 better than you can by hand, but to be honest I tend to still apply #16 by hand (it's a nice product btw). P21S I haven't used the PC with as it is so easy to use by hand.
I would say (imo) that if you don't have either #16 or P21S then to get P21s first and use it by hand. It is so easy you will be amazed, where #16 can be a bit tougher under certain conditions.
Finally - the gold class you have used by hand- well I don't have gold class to try with the PC as I threw it away after a few goes with it by hand, I doubt it would be any use with the PC. I personally don't rate that stuff at all and it doesn't get too many good reviews around here. IMO - you will be in for a big surprise when you start using your PC with other products.
Good luck and get some pictures.
Graham