no, 'tis ok to do more. like for instance 3 sets of flat bench, 3 sets decline bench,2 sets incline bench, and like 2 sets of machine flyes.

look at this websites, it tells u workout programs fro beginner,medium,advanced lifters.

http://www.freedomfly.net/workouts/workout2.htm

http://www.freedomfly.net/workouts/workout1.htm