First, why don't you list what you bought?
Second, read these articles. It'll help you with the basics:
http://www.bettercarcare.com/articles.php?articleId=47
http://bimmer.roadfly.org/bmw/forums...1430487&page=1
http://www.properautocare.com/usporcabpol.html
Third, just a couple of tips, or rather mistakes that I've made in the past.
[list=1]Always mask off the moldings and trim that you don't want to get any product on. Taking your time to mask off the trimming with blue painters tape properly will save you a lot of headache in the future.
Let the product do the work for you and not the machine. Don't apply a lot of pressure trying to cut the surface, bur rather let the product work in its abrasives on its own.
If you feel that you're going too slow, then remember that the more polishing you do the faster you'll get. Take all the time you need because it's always better to do it right the first time.[/list=1]
I'll add more as I think of more as well. You've made a wonderful purchase and the PC is a very versatile machine. The more you practice using it, the tougher the surfaces you'll be able to perfect