Ask what type of credentials the different flight schools have in order to help you in your decision as far as where to go. Look into what types of certifications that the school has as well as what types of certifications that the school offers to the students as well.
Not all flight schools are going to necessarily have the best staff on hand. In many cases they will be retired pilots, but you may want to ask the school about all of the instructors as well as what type of screening process they use to select instructors to help ease your mind.