The program goes like this. There are 10 exercises. You will perform 10 reps for each exercise, rotate through all 10 exercises once, and then repeat the circuit five times until you finished your Another 500 program.
These two methods are similar in some ways, vastly different in others; but both are extraordinarily effective if used correctly. Applying each at the right time during your training cycles is a surefire way to allow for continued growth.
I've often said that while gaining muscle can be very difficult, it's also pretty simple -- at the heart of it, you just need to take in more energy than you expend, and use an intelligent program. This is especially true for beginners.