Thanks for your question.
We normally answer questions about cutting people's debts or expenses, but you are correct that increasing your earning potential by going back to school is a great way to increase cash flow.
If you want a place to apply for an online degree we would recommend a partner, DegreeHound (http://www.degreehound.com )
They can help you evaluate schools and programs.
I can tell you that you should evaluate what programs are out there, and before deciding what path spend some time figuring out what you are most interested in and make certain (before investing in your education) that there is demand for jobs in that field.