Evening and part-time openings around Omaha, procurement assistant here

I am looking for part-time work that fits around school hours and found a few evening shifts near Omaha. I am in Omaha, in case local advice matters. Shifts are four to six hours and the pay is weekly. How many hours do they guarantee?

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.