I would lengthen the hours to 3 hours and run it similar to a preschool program, and allow for some outdoor play as well. I would provide morning snack only.
I would also do set days of attendance for clients, so that you have a consistent base of clients and kids who adjust to the routine.
I think if it’s drop in, there may be such variability as to whether you have clients or not on a day to day basis, but you will have to be ready to work each day in case a last minute client decides to drop in( or sometimes they cancel at the last minute) which leaves you with no income.
I know of people in my area doing drop in care, and they have to schedule their days and pay in advance 24 hours ahead of when care is needed. That way, you don’t lose income, and you’ll know in advance if you’re working or not that day.