There are a few different paths you can take. You can train in homes, you can train for a gym, or you can work with a gym to allow you to come in as an independent contractor. Yes, the last option is difficult, but you can always try to contact a few gyms in your area and make a few connections. Perhaps you offer something they don’t have currently. In addition, if you end up going in as an independent contractor, you may have to pay partial “rent” or other fees to allow you train there. Something to think about as you may have to pass the higher cost on to your clients.
I have my own in-home business, but I also train and teach classes at my local Rec center.
For me me it works well and I have two different environments which keeps it interesting.
It may take some time, but put in the effort and it can happen!