There's a lot of this in my life these days. A case of a volunteer role 16 years ago gradually turning me into a qualified Swim England swimming teacher and coach with 1000s of hours of experience. Planning every session almost takes as long as running the session itself. These based on macrocycle planning for the months ahead.
Three weeks of 'streamlining' then three weeks of 'power/energy' work has been my intention. A good deal of technique improvement is required, and rather more discipline with attendance, arriving on time, and pre and post pool warm up and flexibility.
I take 6 out of 8 sessions for a National Perforamce Squad. I also attend most of the Open Meets and Galas. At times paid hours are soon matched by additional hours yet again done as a volunteer - the nature of British swimming at a small club scale.