Have an Answer?
First get some good certifications like CSCS. It gives you both credibility and also a better understanding of fitness as a whole so you can be equipped to train people of all needs and be aware of what is good for some and not for others. Also, the CSCS will put you in the community more to learn what is available to you.
I would suggest to get involved in a gym and see if there are opportunities into teaching a class.