The rest period between sets is variable according to your goals. For strength rather than muscle size (hypertrophy), longer rests are required—preferably about two minutes or more. For hypertrophy and elements of muscle endurance, shorter rest usually works best—around 45-90 seconds. Considering that this program is designed for a combination of strength and muscle building, you will rest for one minute if possible. Longer rests between sets are sometimes problematic in busy gyms but a longer interval than one minute is fine if that's what you require to continue.
One of the most misunderstood areas for new bodybuilders is nutrition. I talk to guys all the time that have no idea of their daily calorie intake, their daily protein intake, their carbohydrate intake. They have no idea of what types of foods they should be eating, or when they should be eating them. They don't know what supplements do what and what they should using. Let me refer readers to some of my other articles that detail these areas.