How to start into BDSM?

So, my fiancé has told me he used to only watch BDSM, and bondage style porn. I didnt think much about it, but he and I had a discussion the other day. He said “I have never told anyone this, but I have always wanted a BDSM style sex relationship in bed”, I know nothing about this, or have never had any real-life kind of BDSM sex.. but it kind of sounds fun, I’m willing to try, and I want to please him in bed too. Do any of you have any pointers? What did you start with? I just don’t know much about it. Thank you!