It seems like I talk about sleep in nearly every single post on this blog, but for good reason. You've heard it all your life, sleep is critical. I won't go too in detail on sleep, just get a minimum of 8 hours a night and you'll be on your way to increased muscle recovery and improved performance.
3. Perform Compound Movements!
Bench Press, Squat, Deadlift, Overhead Press. Get used to these movements, you'll be performing them twice a week, each. These four movements should be the staple exercises in your workout routines because they require the use of multiple muscles. By performing these compound movements you'll be activating more muscles than you would by doing isolate exercises such as a leg curl or lat pulldown. Perform your compound movements first, and then fill the rest of your workout with accessory movements such as those I just listed. After a while you'll see your mass and strength soar.