This is an interesting post! Are you counting your first set as a warmup? If so, you should try for 12-15 reps with a lighter weight and work your way up. Warming up is essential, not only for safety but for psychological reasons as well.
Now, as for amount of sets. I can tell you this much, I never, I repeat never did less than 4 excersises for large body parts and 3 for smaller. As an example until I began doing 4 sets of pullups for back I capped out at 10 reps with a 25lb plate on a weight belt. Over the years by adding just one more set I can hit 10 reps with a 45lb plate easily. For me its 1 warmup set and 3 working sets the last one being a drop set. The concept of less is better is an idiotic one which was conceived of some dumbass juice head that reads to many magazines. Good luck!!!!!
Now, as for amount of sets. I can tell you this much, I never, I repeat never did less than 4 excersises for large body parts and 3 for smaller. As an example until I began doing 4 sets of pullups for back I capped out at 10 reps with a 25lb plate on a weight belt. Over the years by adding just one more set I can hit 10 reps with a 45lb plate easily. For me its 1 warmup set and 3 working sets the last one being a drop set. The concept of less is better is an idiotic one which was conceived of some dumbass juice head that reads to many magazines. Good luck!!!!!