If you are supporting yourself and/or Especially a family it is a very tall order. It took us about 3 years to get a solid momentum and consistently making a profit. And we own our building. I have not heard anything from you about a business plan, advertising, P&L, etc...
I have been in similar shoes. Me and another student started our school after our instructor bailed on teaching classes. We were able to take nearly the whole student base with us so we had a very good start. Still, it was not lean pickings, it was no pickings for quite some time. After a couple of years my partner moved out of state. We were just starting to make a Little money and I had to decide how vested I really was. I had a very good job and was very, very into competing. Losing my main 'assistant' instructor was a big hit. Fortunately we had three adults who were close to getting their BB that were very vested in the school. I started paying them (a small amount) for each class they taught. Soon after, the school exploded and we opened another location. I had to make some hard decisions and had to sacrifice a lot of time that I did not have to learn how to run a business. I had to give up competing and focus on how to make our dojang the best it could be; yes that included how to make it the most profitable it could be without any sacrifices.
This is not something to do just because it is really cool to say "I own a Dojang". The failure rate for those schools is incredibly high.
I no longer own the schools (the business) but still own both buildings and actively workout and help in the background. The Martial Arts have Never been my only source of income, but like you mentioned they are such an integral part of my life.
I hear the ideals of a young person who is healthy and fit; thinking they will run a full time dojang and be an amateur/professional fighter. Without a substantial base of students and a strong group of senior belts/leaders (that would be adults) it is beyond difficult. You mentioned family; are they adults and part of the teaching structure?
What is your teaching model?
Who, what, when do you teach?
Who helps out?
Do you own or rent?
Who does all the other stuff (cleaning, advertising, paying bills, collecting, etc...)?
Don't half-*** this. Get in or get out. Hitting up a forum is a logical choice but I would not even call it a start. More of a casual reference, even given the vast amount of knowledge here. You have to seek and find, and most importantly do the work.
I found an AMA on Facebook. That is not the support mechanism you need. That appears to be an "official" certificate source, not a means of experience, support and tools you need.
Research seminars and special or open classes in your area. Soak them up like a sponge. Make introductions and relationships. Vitally important.