I was 50 when i realized my submissive side, and discovered collarme. I read enough from the posts to understand the basic ins and outs of meeting people who might be a bit nuts. Of course, i had dated during the '70's and '80;s so i had a fair amount of experience with nutty people.
The thing for me was that dating vanilla and bdsm-type people was much alike. If i was so naïve I couldn't make a fairly accurate judgement about people by the age of 50, i would need to be under someone's care, and not in a bdsm way. The things I need to know was what could be involved in a D/s relationship, because i didn't know enough to determine my limits. And really, if i was with a person where those discussions were being raised, I would trust them to not push me past my comfort levels. And oddly enough - the men i found were exactly those sort of men, which i attribute to the fact that i was self aware enough not to choose a baddie. I might be submissive/masocist, but I'm not stupid.
There was some sub frenzy, but again, NOT stupid.
Relating this to the original post, I'm not sure that there is a huge need for a newbie forum. If you are a newbie and even a bit not stupid, the regular forums work well. They (collarme) gave me a lot of info. with things to be aware of, as did google.