Hi Sue,
My husband has Jewish ancestors that came as a complete surprise. I have found an organistation called Jewish Gen - the Global home of Jewish Genealogy, www.jewishgen.org.
This organisation was recommended by the Museum of Jewish History here in Sydney where I live. The museum does run some genealogy workshops which is helpful when you don't know where to start. You can join Jewish Gen if you wish. They also run classes (at a cost). You can email for general information at info@jewishgen.org or if you want help with genealogy email education@jewishgen.org
Regards
Ellen