1. If you don't have access to EBSCO, subscribe to Questia. This service pays for itself every time I use it.
2. Try to write at least 360 days a year.
3. Find a steady source of clientele.
4. Take the high road but be practical. In dealings with clients, chose your battles -- try to accommodate minor changes for free but charge for major additions or changes that are not your fault.
5. If you retain the copyright to your work product, you can sell these on services such as AcaDemon (I don't know if I can say that or not so we'll see).
6. Be dependable (this is probably the most important thing).
Those are just off the top of my head, but it's like anything else -- you gotta work at it.