What a grand adventure you're embarking on! There's a lot to learn here and a lot of support.
I would caution you about thinking you only want to date a couple. I thought that, too, being bisexual. What I've ended up with and what works for me is relationships individuals. I have two men and two women in my life. It probably makes things a bit more...busy than dating a couple would, but it's the place my life has gone. If you find a couple and it works, that's great. Just don't discount individuals because they aren't a couple.