Evening and part-time openings around Tulsa after 5 years as a janitorial supervisor

I am looking for part-time work that fits around school hours and found a few evening shifts near Tulsa. There are 5 people counting on me, so I am trying to be careful. They can give a schedule two weeks ahead. How many hours do they guarantee?

I worked evenings at a hotel. The hours were steady and the team was friendly, but weekends were busy.