There are a lot of useful documents available on how to get an open source project up and running. This short briefing note from Ross Gardler at OSS Watch is excellent: Essential tools for running a community-led project. Ross has years of experience in such projects, notably those that are part of The Apache Software Foundation. He has boiled down some of that experience here into just the nuggets of pure gold (as I mix my metaphors egregiously).
One of the things that I think Ross gets completely right is his stance on communications. He writes:
A second communication channel should only be created when the traffic on your first channel is sufficiently high to justify the split.
Absolutely! Nothing more than is necessary. Best to just head over now and get Ross’ take on these things. And while you are there, why not visit some of the other fabulous resources that OSS Watch has to offer.