MVPKaj.
My school is less than 2 years old. I started out with 4 guys in my backyard. We then wanted a better place to train, so we rented some space in an old mill building.
This worked out well, and I took on some more students. We had about 15-20 when we moved to our current location.
It's not that big, only 2500 sq. feet. We've been there since Sep. 2002, and now have 65 students. Not bad for us because I don't even have a sign up yet! But that doesn't bother me because our goal was 50 students.
I only teach part-time a the school. I have a day job, wife, and kids. So all of that keeps me busy. But the school does make a small profit.
Word of mouth is what works for me. But I did have an article in a local newspaper when we opened, and I have hung some flyers. But mostly people come in becuase of a student's referal.
I plan on increasing the school to about 100 students this year. I will attempt to do this by advertising in the local paper, getting a sign, and hanging more flyers. I don't think it will be a problem, except for managing the class schedule.
If you plan on doing this full-time, then you will need starting capital. Get a loan if you need it. You want to have enough cash to run the shool with no students for a full year. This will make things a whole lot easier for you. If you do this part-time, and can afford your rent and utilities with the money you currently make, then I would say you can do it to.
The first couple of months for me were tough. I just focused on getting the number of students needed to pay the bills. At the same time you must teach quality lessons, so that your students will refer people to you.
Good luck!
-John