Learning about Abaddon

[frankthetank1869]

To anyone who can help. I am trying to learn a little more about Abaddon, since I believe that he is my guardian demon, however wherever i search there is little known about him. I can't even find his sigil! Does anyone know of a link or some book somewhere where i can get some more information on him? Or someone can just fill me in and that would be great too.

Hail Satan!