How do I do it?

My 2 cents:

Whatever you do, keep it simple for the big dogs up front. They have the most difficult job in sports - handle an opponent in a specific way who gets to line up and move anywhere he wants and has buddies to help. I forget where I heard this (I think it was in a Oneback post?), but it is true - the skill guys aren't the ball handlers, the skill guys are the o-lineman who must step precisely yet be powerful and have many different situations to deal with.

IMHO an offense should install their bread and butter plays and understand those blocking schemes inside and out before they even think about anything else. Getting just the IZ right with the line and the backs can take a spring practice (if you have them) in and of itself. For example, it's been interesting keeping up with Rick Trickett's revamp job at FSU where he is installing the zone game. After the spring he's got some upperclassmen who started last year on the bench and underclassmen ahead of them because the older guys aren't getting it. He's gonna run his base stuff no matter what and the guys that play will get it and do it his way or they won't play. I'll predict they may struggle early, but FSU will have a running game again by mid-season because of his approach of getting the base scheme right and tight.

The things you do with formations, movement in the backfield, shifts, motions etc. is where you get the variety. For example, if you can block OZ to the TB, you can install the Jet sweep and block it like OZ for a different look. If you can run IZ, you can bootleg pass off of it. If you can't execute your base stuff against the defense you will see, all that other stuff just won't matter. If you can, the variety as suggested above gives you more than enough options to take it to the D.

Get the kids to understand that complacency is a killer, if they think they've got it all figured out have them draw up their base blocking schemes against every defense you will see. Throw situations on the base plays at them in practice and challenge them to handle it. Odds are they will get enough wrong that they will begin to understand they've got more work to do and can't afford to get complacent if they expect to win. The challenge for you and your staff will really have to know how to answer it for them and teach them. In the end, that's what it's all about and the competitive challenge we all face.