The non Frostgrave cultists are older Wyrd Mini's Crueligans (now OoP), the barely dressed necro is from Reaper, and the lady in green is Inge from Heresy Miniatures (Go buy stuff from him, he's a good bloke.) The demons are Reaper Bones but I don't recall the name.
I spray prime all my Bones stuff with Vallejo Surface Primer from an airbrush, it sticks fine. If you are used to aerosol cans you can start painting direct on it with out that primer step, just don't thin your paints as much. Bones can be hydrophobic.
I might have gone in hard on the purchasing for FG. I haven't done much gaming since moving to Hawaii, finding a place where I didn't need to do 40k to get a game in boosted m production. I haven't even showed off any scenery I have done for the game.