BDSM FOR BEGINNERS

Is it just me or is anybody else who hasn't tried BDSM curious to what it feels like? Like for years it's been something I want to do so bad any in my previous relationships the guys I dealt with were fucking pussy to everything... But my husband now will do anything with me if I ask him to... But when it comes to BDSM he has a nervous look on his face. I ask him would he like to try it he didn't say no but he also didn't say yes either. But I told him about the starter kit I'm purchasing and his response was ok but with a nervous look. lol I even told him when I purchase the kit he can definitely be the dominant one and I will submit to everything. Lmao but in the end he still looks scared. So how do I get him not to be nervous? because I want this to be a good experience for the both of us.