Here's something that I pulled out of my classes. These aren't definite guidelines, but they're good recommendations for training muscular strength, endurance, and hypertrophy (size).
Note: 1RM = 1-Rep Max
Endurance
Frequency: 2-4 days/week
Intensity (Of 1RM): 40% - 65%
Sets 1-4
Reps: 12-25
Time 20s - 60s
Rest Between Sets: 20s - 1 minute
Hypertrophy
Frequency: 2-4 days/week
Intensity (Of 1RM): 70% - 80%
Sets 1-6
Reps: 8-12
Time 15s - 30s
Rest Between Sets: 1 minute
Strength
Frequency: 2-4 days/week
Intensity (Of 1RM): 80% - 100%
Sets 1-5
Reps: 6-8
Time 10s - 15s
Rest Between Sets: 1-3 minutes
Note: 1RM = 1-Rep Max
Endurance
Frequency: 2-4 days/week
Intensity (Of 1RM): 40% - 65%
Sets 1-4
Reps: 12-25
Time 20s - 60s
Rest Between Sets: 20s - 1 minute
Hypertrophy
Frequency: 2-4 days/week
Intensity (Of 1RM): 70% - 80%
Sets 1-6
Reps: 8-12
Time 15s - 30s
Rest Between Sets: 1 minute
Strength
Frequency: 2-4 days/week
Intensity (Of 1RM): 80% - 100%
Sets 1-5
Reps: 6-8
Time 10s - 15s
Rest Between Sets: 1-3 minutes