You'll find quite a bit of discussion centered on monofolk adjusting to their partner coming out as poly. We have several active members in a position akin to yours and I suspect they'll be happy to add you to the conversations.
When speaking of various forms of non-monogamy...it ain't poly if you're just fucking around.
While polyamory, open relationships, and swinging are all distinctly different approaches to non-monogamy, they are not mutually exlusive. Folks can, and some do, engage in more than one of them at a time--and it's all good.