Practice Structure

How do you guys structure your practices? I'm looking to streamline my practice time? Also, looking for more ingenius ways to practice Varsity and JV. Usually have them practice together is fundamental groups but separate during scrimmaging. And, who runs your scout team? I (the head coach) like to run as QB (no hitting the coach) with second stringers. I feel that I can give a better feel because I watch so much film.

Thanks in advance.