Hi N shadow,
Welcome to our forum.
What is polyamory? Well, in http://www.polyamory.com/forum/showt...5366#post15366
1: the state or practice of having more than one open romantic relationship at a time.
2: romantically loving more than one person at a time.
3: responsible non-monogamy based on honest open communication and conscious choices.
Beyond that, you will hear the word be the subject of many debates.
How does one get into it (e.g. how might one broach the topic with someone else)? Some people wait a few dates and then (if it looks like it's going anywhere), say, "I need to tell you. I'm polyamorous. Do you know what that means?" Maybe the other person will run away screaming, but maybe they'll stick around and be cool, who knows. Another approach is to get to know someone strictly as a platonic friend, then (in some conversation where it comes up) tell them about your poly status and how it works. That way, there's no "pressure on them to accept it," and if the friendship does develop into a romance, they'll already know how they feel about the poly thing.
How does one do it? Ah, that could be the world's largest answer ... We have this whole website to help us know how to do it. Among the biggest parts of the answer, are, one does it (preferably) with generous communication and totally transparent honesty. One does it with a willingness to let others be themselves, and to let the relationship/s be what it is. One does it with an ever-accumulated base of knowledge (from books, this website, etc.).
Hope this helps!