Drills should only be used sparingly to fix a specific issue or to introduce a new concept. The problem with most drills is that they do not replicate what happens in the actual pitching motion. The classic example of this is the wrist flick. A warmup routine is just that, a routine used to prepare yourself to pitch at full speed. Start with the core and work outwards to the extremities. My DD would start with the typical running, stretches, etc. and then move into long toss. By the the time she finished long toss she was more or less warmed up. Her core was warm and her arm was loose and relaxed. At that point she would go to the bull pen, do some walk throughs and then go to full motion to get her pitches working. Only then if she was having an issue with a pitch would she actually get close to the catcher and isolate on the release to fix an issue with the spin of a pitch.
Ok, that helps.