Apprecenticeship cannot be skipped, young padawan learner
Definitely start with afocal of the moon, however I don't know why your webcam can't come to focus at prime focus!??
Maybe it's because an f/6 scope, but I'd be surprised. What adapter are you using?
Webcam imaging at prime focus is infinitely easier (well, at least 2x easier) than with a 2x barlow..