Welcome to our forum.
I'm sure you'll be able to make some good friends here, get guidance, and learn a lot about polyamory. You may find the Dating & Friendships subforum
a helpful place to visit sometime. In the meantime, check out our various threads, and see what calls to you. Post any questions you may have.
It sounds like you have a good marriage, and are just looking for a little more emotional depth in the area of outside relationships. Polyamory seems to be a "slower process," so wear your patience hat.
I'm glad you could join us.