Regardless of the drill, getting comfortable behind the gun and learning to track the tights and call the shots is what’s most important. A couple of targets set up like el prez like Chenalt said will allow you to also get comfortable with transitions. Shoot slow, watch the shots, feel the gun recoil, align it back up, shoot again etc... you’ll be wasting time and ammo if you just go out to the range and start blsting bullets all over the place and don’t realize what’s going on