I'd probably go as far to say that the majority of people in the BDSM lifestyle don't go for it 24/7. You just have to find a level that you're comfortable with and run with it. As has already been said there's no set way to enjoy the BDSM lifestyle. It's such a wonderfully varied and satisfying lifestyle that it will always be what you make of it.
I understand your concerns about how to approach a relationship with BDSM in mind. You don't want a 24/7 thing so that would preclude just looking from a slave on a forum. You're probably going have to go with one of the more mundane routes of getting a girl/boyfriend and then having to subtly find out if they're into the lifestyle at all. From my own perspective I don't think I could ever have a truly vanilla lifestyle ever again, but you may find that anyone you find can fulfil you whether they're into the scene or not.
Best of luck to you anyway![]()