Psychological newbie question - How to start trust people?

I recently became interested into the BDSM theme (from the sub perspective).

Just I want to say that I have some trust problems in real life and usual sex.

As I know, the main base of BDSM relationships is trusting each other.
And there I suppose is a question: how to start trust people, how to make the first step into BDSM?

I mean if I will be lucky enough to find somebody adequate (who won't go to the 'restricted area' and who doesn't want to record whole thing on the video and will never told anybody about it (I know this sounds kinda paranoid)). Even if I'll found that rare guy/girl, how to start trust to him/her?

Please, no jokes, only responses.

Hi and welcome!

I think this is an excellent question and something often overlooked. Trust isn't automatic or immediate.
In fact, I deeply distrust people who trust too quick.

The Only way I know to build trust is by taking time and learning the other person. Slowly learning that the persons words and actions match.

I also believe that trust can only grow when both partners consistently show trustworthy behaviour.

Over time...with open and honest communication, you will notice trust blossoming.