Re choking, I have a post about the kink here, with tips that largely repeats what @Kh1985 said, along with more of a how-to. I hope it helps 
In this household, we personally watch a lot of sex documentaries. They rarely turn us on, because by now sex is sex and it’s usually something totally vanilla that gets us into something incredibly steamy, but still, they can act as a point of reference. They can invite questions we might not have thought to ask one another before: “would you like to try…?”
Porn can also be good for this, though if they’re horrified by what they’re watching then the chances are, it’s probably a “no” 
Lastly, don’t be surprised/disheartened if what you thought would be hot, isn’t. So, to give you a bit of backstory here, the first man that I was intimate with was 20 years older than me (the things we do when we’re curious and horny
). That ignited a fetish for age gaps in me that kind of still exists to this day.
Also, I was extremely close to my Dad, but never sexually close to him, obviously, because that’s illegal. Around 12 years ago I started exploring the Daddy Dom kink, but time and time again it gave me the ick because I was extremely close to my Dad - it felt like I was crossing a border that shouldn’t be crossed, even with someone who wasn’t him.
Dad passed away in 2019, leaving a huge hole in my heart. I was off of the kink for a long time because it felt like I was trying to replace him, yet, I still felt like I wanted and needed something, someone - a Daddy.
My husband loves being a Daddy Dom to me, he loves providing me with care, support, affection and protection (the fight to stay out of Little space is real here
) and I was eventually able to differentiate “Dad” from “Daddy”. Then, and through my work, I started to meet other men who also enjoy the Daddy Dom kink, including the taboo side of it, and that piqued my curiosity: does that turn me on, too?
So, we tried it last week, and what I can tell you is that far from turning me on, it left me feeling positively horrified. I felt sick, positively disgusted at myself, even slightly traumatised. It wasn’t hot for me at all.
So, as I say, explore CNC by all means, but don’t be surprised if you later discover it isn’t what you want 