Football Coach Gulf Coast H.S.
Here's a discussion from the Alabama Football Coaches Association clinic that covers some linebacker options and stunts and ends with game film showing those stunts in action.
Start by looking at the film to determine the creases you've got to defend...then you can give your linebackers assignments.
More defensive schemes and options on how your linebackers work with your down linemen to stop the offense.
Here's more stunts you can use to confuse the offensive line and mess with their blocking schemes (and their running backs)!
Here's a good film review "how to" and a demonstration of some of the stunts that were covered in the first 3 segments.