Welcome to our forum.
You could try our Dating & Friendships subforum
if you haven't already; also you could try Googling "polyamory Arizona" and see what turns up. There might be a local poly group in your area that you could meet with.
Of course if you have questions, and don't know the answers, you can always post on this site, and there will be people willing to help out. Don't be in too much of a hurry; take your time to learn all about polyamory before attempting the lifestyle. But kind of along the lines of what CielDuMatin said, tell your wife soon that this is something you've been researching.
I hope that this site can prove to be a good place to get the help and answers that you need.