How do I introduce new things to our sex life?

My husband and I both have experienced desires of wanting to add things to our sex life( sex is amazing as it is just a bit vanilla) but neither of us have initiated trying anything new. I would like to try some light bondage, maybe some choking, and he wants me to be more dominant.... The thing is I believe we're both very sheepish and timid so I don't know how to bring it up. I don't want to just blurt out for him to choke me during sex but IDK what to do. And I also don't have any idea in hell how to dominate.