through a great seminar at the WGBH Producers Academy, i made contact with a really helpful person at PBS (Kathy Lo). When I told Kathy that I was looking for an EP, she then introduced me to a bunch of different people who would make sense for my project (e.g. Freida Lee Mock, Renee Tajima-Peña, Steven Okazaki). After she made the intro, then I made contact with them through email. Renee turned out to be the best fit.
what i might suggest for you is to find a PBS film (or 2 or 3) that you really like, do some research to see how it was funded, and then if it's a good fit, go and track down that person. if you need help, i can always give Kathy Lo a call on your behalf.
lastly, are you applying for Sundance's next funding round? they are really good at giving first time filmmakers a shot at the money. if your footage is really compelling, and you get funding from them, that really makes it easier to get an EP on board.
i'm sure the more experienced vets here have better suggestions than i.