There is no one-size-fits-all approach to gaining muscle mass or working out. But I am going to make some sweeping generalization here. But please keep in mind that I'm no expert. This is just what I've learned through my own research. If you want a truly knowledgeable opinion, go to the experts by looking at the programs reviewed on this site..
That said, I've listed the main goals that people who want to build muscle fast usually have. Find your main goal(s) to learn the things you should focus on to make your muscle workouts more successful.
If your goal is to build maximum muscle mass as quickly as possible, focus on:
If your goal is to build more muscle quickly, but lose weight while you do it, you should focus on: