ummmmmm..... theres an official facsimile version already out and available as a PDF that you can use....
THE Supernatural™ BOOK of Monsters, Spirits, Demons, and Ghouls.
By ALEX IRVINE
Illustrations by Dan Panosian
Supernatural created by Eric Kripke
Harpercollins Ebooks
234 pages written in a first person account, that could be copied and pasted.
An excerpt (incomplete just part of the listing) on the Yellow Eyed Demon
"We know him mostly through his work. He moves into bodies at
will. Once he possessed Dad, and we learned something about ourselves
there. We could have killed him, but it meant killing Dad,
and in the end, it wasn’t worth that. All of the stuff that works on
other demons doesn’t even make him blink. When he was possessing
Dad, we doused him in holy water and he didn’t even notice. He
doesn’t leave behind the sulfurous stink that most lesser demons
do, either, and ordinary demonic apotropaics like salt and binding
sigils don’t seem to bother him much. He will respect a summoning
if it’s perfectly carried out and the summoner has good manners,
which is typical of demons. We have a theory that they like to be
summoned, since it gets them out of hell, and don’t want to ruin
their chances at another vacation by dismembering every conjuror
who comes along. Plus,
most of them like to talk.
God, do they like to talk.
Most of them can be summoned
by a standard pentagram
doctored with the
right ritual candles and so
forth, but for the Yellow-
Eyed Demon, you need the
sigil of Azazel."