IT's important to consider demographics of the people in the geographical area that you're planning on targeting.
Can they afford your course, will they be interested in it, will they understand the material, can they perform the functions required by the class?
If your class requires some pretty advanced techniques or concepts, people that have only a GED, or less may not be the people you're looking for.
How educated are the people in your area?
How far are more educated people willing to travel for the course you're offering?
Demographics of the community are key to success, a proper demographical analysis is critical to how well your course will do.