I'm at the same stage as you, just ordered my stuff and don't know how to start - so I'm waiting to heat what ppl reply.
Anyhow, I read some where that speed 2.5 or 3 on the FLEX is similar to speed 5 on the
PC. So I was going to following the youTube references that say to run the
PC at 5 or 6 to work the polish in moving 1 inch per second w/ 50% overlap. Since I'll be using the FLEX I'll just use setting 3 instead, once I get comfortable I might move up to a higher speed.
btw: I'm going to test things out on my Jeep first b/f moving to my BMW.