I first started off using my mates Porter cable on my clio, it did correct around 85% but now I have my rotary I can get it to go pretty much 100% correction, I have done on my bonnet and it looks brilliant
Best thing to do is start with a dual action and once you're more confident buy a rotary, rotary's are pretty cheap anyway, I know the silverline and kestral rotary's are identical apart from colour
As for compounds, Ive always used 3m, Tried some poor boys compound and for cutting its no gd, but for finishing its spot on
Pads - I started off using 3m 3 stage pads (green, yellow and blue) Ive now moved on to a flexi pads cutting pads and still use the 3m finishing pads