Below you find the links to some good sites that give you basic/generic information about some of the races that are allowed on this board, such as Angels, Demons, Vampires, Werewolves/Beasts/Lycans, and other various things. If you still find you have questions, please feel free to contact myself, or other members of the staff once that option is avalible.

For the link to a general site that talks about Angels, Demons, Vampires, and Werewolves/Beasts, go here: http://demons.monstrous.com/index.htm
very basic, but it still gives you an idea of what people think about the mentioned creatures.

Here's the link to a site that's predominantly about Demons, and the different types that can be used, as long as you stay within reason.
http://www.deliriumsrealm.com/delirium/myt.../demon_list.asp

And finally a link that's all about angels, or at least the chiors/classes that are allowed on the site. it's too bad i couldn't really find any good information about Fallen Angels. Ah well, i'll keep my eye open.
http://www.catholic.org/saints/anglchoi.php