Mutsy-There are many opportunities in teaching online classes. Schools like the University of Phoenix and Kaplan are always looking for instructors with a Masters degree in their area of their specialty.
These online college classes are flexible and they allow you to add more to your course load. It is not unheard of for those teachers teaching college online classes to earn up to $100,000 a year because you get paid a flat rate per class.
You just have to determine how many classes you are willing to teach and that should give you an idea of how much you will make.
The only downside is that you are considered an independent contractor; therefore you will not be able to get any form of health benefits from the company.