Writing Demonolatry With Verisimilitude

I don't know how to be any more clear. I'm looking for advice on writing Demonolatry in a piece of fiction. I'm an outsider to this. You guys are the experts on demons and invoking them. I just know a bit about writing, lurid sex, violence, motorcycles, and MC culture. So came to you looking for a bit of direction.

I put "devil worshipper" in quotes specifically because I understand that most (or even all) of the people who read this won't see themselves this way. But whatever Demonolatry means to you or anyone else here, it very literally means "worship of demons."

So, very specifically-

Is there one book or source that you would suggest to get enough of an understanding of Demonolatry that I could present it with respect?

Is there a particular demonic entity that you'd suggest that would be invoked for either or both of the reasons above? Or should I look elsewhere?

Under what circumstances do you meet other practitioners of Demonolatry and work together? What makes collaboration work? What makes friction between two or more practitioners?

Thanks

/r/DemonolatryPractices Thread Parent