I think you might want to flesh out this idea a bit more. Also, you might want to check out some source material that's gone there before. Stuff like Vampire: the Masquerade books, movies like Vampire in Brooklyn, horrorcore hip-hop artists like Gravediggaz or Brotha Lynch Hung, and maybe look up some information on voodoo and settings that utilize that atmosphere like the old Shadowman comics and video games. And remember that, much like pimpin', GMin' ain't easy.