Above all else that you do in education, classroom management skills will pay greater dividends. I cannot tell you how much more teaching I actually get done now that I have learned how to get and keep children quiet. This one skill was the single thing that prevented me from being useful at all during my first two years as a teacher. This one skill was the single thing that allowed me to be supremely useful in my third year of teaching.
No matter what you do, do not underestimate the value of spending time learning and refining classroom management skills. No other educational endeavor will be as fruitful.