You won't really know how you're going to find someone, may it be through dedicated websites, simply chatrooms or maybe in real life.
Me and a good friend online came closer over time, talked a lot about different things, including personal sexual preferences and such. Eventually our friendship developed to a kinda friendship+, him being the dom and me being the sub. We got into chastity, and that's more or less how I also found this wonderful place here.
For me, this friendship+ is ideal, I'm currently not really searching for a partner, and I'm able to just, live out my sexual fetishes, as well as he does. This has been going on for a month or so, and we're both having tons of fun. Maybe we will meet in august, but that's not really clear yet. He lives in Germany, I'm from Austria.
But in the end, it doesn't really matter where or how you meet them. I'd suggest going onto KakaoTalk and/or Kik, both free messengers, where you're anonymous. Both messengers have a huge role play community, and I'm sure those community's include some people with the same interests as you have.
For long distance relationships, it will come down more to obedience, since you will be the one who's actually "holding" the keys, locking and unlocking yourself, but only if allowed to.
I hope I could help you a little bit.

Sorry for any typos or grammar mistakes.