I'm really new to this myself, but I do recomend reading both this foruns (the blogs and the "general poly discussion" for example) and some sites about poly. I found a lot of great texts on http://www.morethantwo.com/
Also ask V to read a lot about it too.
Big part of my experience with poly working out was that I had it in mind for a long while and both me and Peaches did a lot of research on it. The first thing we ever saw about it was a documentary. If I can find the name, I'll come back and tell you (It's been a while).
Aside from that, I'd recommend the basics: Comunication, Trust, and emotional maturity from all parts involved, TO all parts involved.