As a guy whos wife came out and said she was poly. I have to agree with Ari. Take your time, do your homework and above all else learn to be introspective. You have to start by knowing who you are and what you need/want. Research this board there is a ton of great info that all us "old timers" have put up there for people in situations just like your in now.
Just a FYI you dont HAVE to be poly to be with someone that is poly. I wont drop any names
but there is a major sucsess story on this board of just that type of relationship. Keep in mind that Polyamory is two parts:
Poly- meaning many
Amory- meaning love
One with out the other is not the same thing.
PM me if I can help you with anything.
Peace and Love