Fast food is always a good place to start so long as you and your son are prepared for some late hours including weekend work, after school, late night closes, early starts, public holidays etc. assuming that you are going to transport your son. Teaches you about cash handling, customer service, handling complaints, cleaning, food preparation, teamwork, working in a fast paced enviroment, under pressure etc. I worked at KFC for 10 years, started out as a cook and progressed through the ranks to team leader, shift superviser, assistant manager. 10 years was enough but if I wanted to progress further I could have. If you put in the hard work and the hours you can progress quite quickly. If you are looking at fast food, I would probably say go for McDonald or Hungry Jacks, I believe the support and structured training program they have is much better then KFC ever was. Plus, when I worked there, KFC was a stingy, greedy, target focused company who ran their business on very little staff each shift. But that wa s along time ago and hopefully times have changed.
good luck