Understand the market of that area.
1. ask around the student parents, do some questionnaires, get the feedback from parents and student about quality of the tutors.
2. don't invest in something you don't familiar with, get a partner or two who are in this industry, listen to his / her opinions, and think it through carefully and analyze careful if this is feasible business idea. don't listen to someone who has conflict of interest or some noob.
3. Business is like gambling, Market is what make or break you. So what you can do this minimize the market risk, by keeping your self well informed. Risk can never be eliminated. but only minimize.