Part-time jobs that fit around childcare - what worked for you?

I am looking for part-time work that fits around school hours and found a few evening shifts near Wichita. I do not usually post, so bear with me. Shifts are four to six hours and the pay is weekly. Is the schedule really fixed?

Keep everything in writing and save the confirmation numbers. It saved me later.

Check how they treat part-time staff for benefits. Some add them after a set number of hours.