Craig,
Rebound is the little brass screw in the top, and Comp is the little screw underneath the rubber plug, on the very bottom of the fork leg.
I am unsure what stock is, but usually ~middle on both C and R is "stock"...follow the general guidelines that Eric Gorr has on his site and u should be fine.
FYI: once u start getting a little speed over abrupt, short, edged-type obstacles, that shock WILL kick pretty badly upon rebound, (unless it has been re-valved), so don't worry about trying to completely cure that malady, when you finally experience it. I have two f these bikes, but have the front and rear doen one both, and Race Tech std gold valves in the f and r onf one, as well. The g-valves are veery nice...once u get fast enuff to need it, I recc' them.
EXCELLENT bike choice, btw!