Start out keeping it simple, learn the PC.
You need to learn how to operate the PC, that's most important, all the best products does you no good if your technique isn't up to par.
If on a budget try this.
Get yourself a bottle of Ultimate Compound which is cheap and found locally.
Buy you at at least two CG'S orange hex logic orange pads and two white pads.
Clay
UC. 4-6 slow passes with good pressure, just make sure the pad has some spin.
Inspect the area, if it looks better then move on to the 205 using a white pad with less pressure but still good pressure, put a mark on your BP, watch is closely to make sure it's spinning, it shouldn't be spinning fast, just enough to see that mark going around and around.
Keep it flat as much as you can, on curved panels you may have to lift a little to keep it spinning.
Junkman has some great videos, I suggest you watch a few and watch them a few times until you feel you can do it correctly.
Good luck man:dblthumb2:
You can do this.
Btw. Once you get the hang of using the UC you can always move up to something better but the UC really can do the job for you.