Avoid buying a coarse pad at first. Buy polishing pads that are softer or less aggresive in material so you can't damage your paintwork while you learn how to detail or use the Rotex. Lower your speed and pressure to also avoid any issues, although with foam pads at a lower speed, you're much less likely to get the paint 'burn' at a trunk or door edge than someone using a wool pad at high speed.
Depending on the condition of your paintwork on the vehicle, you can often get much better results washing it, then applying Clay Bars to pull up alot of 'crud' out of the clearcoat or solid coat before you even take the Rotex to the paint.
Doing this extra step, esp. for the first time with your car gives your polishing work that extra depth of light reflection or shine to it since you've removed material out of the way that you don't need to try and correct with a polishing pad after claying the paint.
Polishes- Start with a rated mild polish always, you can always move up to a more aggressive one if needed, but too coarse is just like woodworking, you end up working with larger scratch patterns than you needed to......
Glazes, contain fillers for defects and scratches that allow you to hide or at least minimize something that would require too much paint removal to get down into while polishing. They're great for old paintjobs or worn vehicles.
Waxes, so many out there, find one that works for your vehicle or lifestyle and stick with it. Some are better at a shine, but don't last as long, others last, but can seem a bit more of a satin or semi-gloss once you're done.
Sealers- generally, if you can't garage a vehicle and it lives outside all the time, these will hold up better to the elements than wax for a longer period of time.
Festool pads, Orange is the all-around pad, Medium in aggressive-nes... [wink]
I really like their Black Honeycomb polishing and waxing pads. Hold up well, and are flexible enough to handle the curves on the sheetmetal very nicely.
The pads clean easily with the right cleaner, I use Griots Garage Pad and Microfiber cleaner. Works very well. Others use Dawn or similar dishwashing soap.
Hope this helps you out.