There is no 'right' way. The sooner you learn that, the better your coaching career goes.
It's not easy to accept, of course. I wish there was a right way. I wish there was one single scheme that would beat everyone else every day.
As long as no one else knew about it, of course.
But there is not. Every scheme can work. Offense, Defense, Special Teams. If it's sound and it fits your players (and you can teach it), you can win with it.
And every football team is different. Your players are probably different from week to week - and even day to day. 
How your scheme gels together... how you turn 11 individuals into one unit... that is going to change every day. 
That requires you to be a flexible football coach. To have a toolbox of answers waiting. 
Knowing when you use them? How to teach them? That separates good coaches from great coaches. 
Check out Episode 145 of The Football Coaching Podcast to find out how you can be a Flexible Football Coach!