Did somebody call?
First, a link that might be helpful to my old Diana's Magick Thread:
http://www.absolutewrite.com/forums/showthread.php?t=18583
Now, I am a sorceress of some note. I no longer use magician as I used to, as it involves all kinds of connotations: robes, spells, circles, that I have found to be redundant and unnecessary for my purposes.
Now, as Mac suggests, Enochian Magick might just be perfect (angels and demons) for your uses. However, it happens to be the most complicated and obscure form of the Western Occult Tradition.
The source for all Enochian writings is Dr. John Dee, advisor to QE1, mathematician, navigator, and magician. His work is in either Latin or Old English and is difficult to penetrate.
To start a proper education in general "modern" magick:
Magick - Aleister Crowley
Psychic Self-Defense - Dion Fortune
The Tree of Life - Isreal Regardie
Transcendental Magic - Eliphas Levi (A.E. Waite's translation)
For Demonology:
The Goetia: Or the Lesser Key of Solomon - Abramelin (tranlated by Crowley & Mathers)--an actual grimoire
Enochian:
Let me check my library for proper references.
I shall return.