TCG (Theatre Communications Group) publishes a monthly job listing called Artsearch. It comes in an on-line edition as well. It is also not all that cheap. The good news is that often libraries or universities will subscribe and you can look at it for free.
Thre are all sorts of job openings at member theatres all across the country listed there including development. Salary ranges are often included.
Learn how to write foundation grant requests. That you can do if you intern somewhere. Call your nearby regional theatres and see if they will take on a part-time intern this coming academic year. Grant writing isn't all that hard although it is sometimes time-consuming and more often just dull.
"If my life weren't funny, it would just be true. And that would be unacceptable."
--Carrie Fisher
