Much has been written about the Infernal and Celestial heiarchies. You can find such rankings in grimoires and online, and a few places that they can be found have been noted below.
One of the most important personages in the evolution of demonology was Dr. John Dee. Dee supposedly carried on conversations with an angelic being which taught him the Enochian language. Use of this language, and its gematria, was essential in sever rituals to summon and converse with angelic beings.
Aleistair Crowley was also involved with demonology. He supposedly went into the desert with an associate and summoned the demon Choronzon. After his audience with the demon, though, he did not appropriately banish the demon and it is said that he was possibly possessed. His manner changed sharply and he died soon after.
Items required for demonological rituals are various, and vary by text, but a few things remain constant. A magick circle is necessary to prevent demonic attack, a medium must be present for the demon to form in or be seen in (a crystal ball or incense smoke), and an altered state of consciousness must be obtained through some means or another. Also, the entity's sigil, a personal symbol akin to a signature, and name must be used.
Necromancy is misunderstood in modern times, likely more misunderstood than demonology. The Necromancers of Greece were greatly respected, as they provided a useful service to the populace by granting closure after an untimely death. Voodoo priests were the central figures of a tribal community. Necromancy, though dealing with a rather grotesque subject, is a fascinating example of how the dark side can be a boon to those around one who properly utilizes it.
doctrine of faith. Justan arrangements of superstitions, the most well-known of which is the voodoo doll. A mock-up of an individual is subjected to various pokes and prods, and the desired result is thatthe individual will feel the effects."
Loki (Matt Damon), Dogma
For some odd reason, modern Neo-Pagans and Wiccans absolutely cannot abide hexcraft. Their precious rede "An it harm none, do what ye will" is such an obvious ripoff and bastardization of the Law of Thelema ("Do as Thou Wilt shall be the whole of the Law. Love is the Law, Love under Will. There is no Law beyond Do What Thou Wilt.") that it absolutely sickens me. Hexcraft, though, is a strong point in many traditions, and can be viewed most prominently in voodoo. Negro slaves believed that getting ahead in the world was a moral imperitive; a person's goodness can be judged by how much stuf he has and by how much he can get away with without being caught/punished. European "High Magick" is also full of curses and bindings, evidencing how the aristocracy would resort to heretical practices to get what they wanted.
Voodoo is also, however, a complex, community-oriented religion worshipping family spirits/gods/"loas" whose rituals have much in common with Pentecostal Christianity (my apologies to any offense to the voodoo community by that remark). Practitioners go into trance states amid rythmic drumming and are said to become "possessed by the loas" in which they often speak in tongues and prophesy.
I would advise a simple study of voodoo to understand the complexities, which I cannot possibly even begin to explain here (since I do not fully understand parts of it myself).
The foremost of these texts are said to have been written by King Solomon himself. Supposedly, in return for building the Temple, God sent an angel to gift Solomon with a magick ring that would control spirits. Solomon used this ring to find lost treasures and fill the Temple with gold. He also used it to seal the more malicious spirits in clay jars and other containers. This is the source of the Arabian legends of the djinni, for the demonic entities held great power and would often perform some service for being released from their prisons. Thus, tacking the name of Solomon onto a text would be a great boon to the proliferation of such a text, despite the authenticity of such a claim.
Following is a list of the more famous grimoires.
