do as many reps of an exercise as you can (just before hitting failure), then move on to the next exercise. then, once you've completed all five exercises, do a second round. you will likely have lower numbers on the second round. that's ok...you're still building strength and endurance.
keep doing that until you can hit the numbers that have you moving on to the next level. so, once you can do 50 pushups with minimal rests (that may take a while to reach) then move on to whatever is next...either wide/narrow or inline.
did you do the fitness assessment at the beginning? that will tell you what level you should start on.