The Polyamory Society is a great place to find out a lot of the basics of polyamory; how it got started, where it is today/where it’s going, and poly events going on across the country. Also contains a wealth of other polyamory resources!
Meetup.com offers polyamory meetups near you. I highly recommend going to a poly meetup and interacting with fellow polyamory couples and singles to learn more and better understand polyamory in general.
Reddit offers a great polyamory section that couples and singles interact with every day. This is a great place to talk with other people to learn more about polyamory and other people handle their business!
More Than Two
Morethantwo.com is a good resource for the more in-depth polyamory questions. While many websites are bland and simply offer a blanket overview, this website will surely be able to answer your question.