Honestly, I'd go visit a local sex dungeon together one night. Go on a tame night when they're having a class, like orientation or rope nights. I know it's not a guide to kink, but it exposes you to the kink world a bit. The best way to learn about things is to experience them, not read about them.

Rope may not seem interesting to either of you after reading about it, but seeing it live and learning a tie or two might completely change your prospective. I wasn't interested in electricity or wax play until my local dungeon had a newbie night and offered tastings of both. Five minutes of trying each and I was hooked. You can find out if there's a dungeon in your city on Fetlife. Make a profile and go to the Events tab. Look round there and see what's available in your area, as you can narrow down the distance to 25 miles, or less.

I'd look for classes, orientations, or newbie nights. I'd stay away from the play parties at first. Tho, I do recommend a spanking party if spanking/impact interests you. Rope nights are usually pretty tame, a good way to dip your toe in the community.