RN-MSN education or Case Management Cert any adivice????

I have a diploma in nursing (28 years worth of experience) and a BA in special education. I work in a peds office and I know I can't keep doing that for another 20 some years til I retire. Anyone have any thoughts on what would be the best path to take.... I am interested in both teaching and case management. I do not want to spend a lot of money on a degreee if I am never going to make it up in salary,,,, I am really puzzled as to what to do? If this type of thing was discussed elsewhere please direct me to the thread
Thanks a bunch for any suggestions/advice