I'd watch some deep dive into some college plays for half an hour. Todd Blackledge would be great at it I think, he does a little of this in games.
"The defense is in a basic set here, but you can see the safeties taking deep drops at the snap, and this safety reads the QB's eyes and drifts left leaving the tight end being covered badly by this OLB. The QB now looks off the safety and throws a strike down this middle to Rozsinsky for a big gain. Now, also note that the running back did a great pickup on the OLB who had the edge, he almost missed that, while the center missed his man entirely, but the tackle was able to chip him."