Make sure you have enough money to survive for 6 months min. for space, utilities, and any other operational costs.
Income in area
Enough money to market in the area-low cost marketing is not always ideal
Your passion and willingness to be a business person more than your passion for the class you teach. You need to do what is best for the business over what you thought may work.
I have constantly changed to make things work and offered different products and services. Be adaptable