If you haven't done the blackflame quests, then think like a madman/criminal and try to get quests from the underbelly of society; those are the types of folks who your character will want to serve or associate with if your character is of this alignment. To write about Blackflame characters you really need as much setting material as possible - which is found in the game. If you are interested in writing about characters of other alignments who interact with BF characters, then I am open to that too. This is more about writing and story creation, and less about gaming.
As for divulging infomation, I do understand the need to keep In Character and Out Of Character information separate. Some folks may not want to write about their BF characters on the forum for fear that inexperienced players may mistakenly take what they read on the forum and try to use it in-game.
My personal stance on this situation is as follows:
From an in-character perspective, if your character accused my character of being a Blackflame follower, he would most likely riddicule your character for believing such silly, childish things.
If I find that OOC communication is really needed, then I'll just ask the player in an OOC tell how their character would know this. If their answer is logical/believable, then fine - I'll just continue to deal with it in an in-character way.... that might include public humiliation or a knife in the back. If the other player is incapable of separating IC and OOC info, then fine, I'll just ignore them... though I really hate this last option.
Despite the Blackflame stories that I have written on the forum with my characters in the past, this has never happened to me. Nobody has ever tried to use this OOC info against me in-game. It could be that such inexperienced players don't bother reading whats in the in-game roleplay events section or just don't care.
Now that my post count for my re-made account is >10, I'll start PMing those who I have yet to speak to. Thanks to those who have shown interest thus far

Whisper Bless!