High Wing Drifter,
the flying school you will work for will provide you with trial lessons when you start. Then it is up to you to start your own "business". These trial lessons are very important for you, listen very well to the people, give them an unforgettable flying experience and answer all their questions. Try to convince them to come back for a real flying lesson but don't be too pushy. Don't think short term only. So, during the trial lesson you have to do your sales pitch. If you are good at converting people to start a PPL course, you are in business and your employer will love you for it. The rest will follow automatically...
Good luck and go for it!