Is there any information more on the topic of demons that are not of satan? Any texts I can read or must I reach a certain point in meditation before I start to understand and recognize entities not of Satan.
There aren't any "Demons not of Satan", at least in the way we use the word Demon.
Spiritual Satanists use the word Demon for friendly beings that are on Satan's side. Christians and other outsiders use the same word for every being they think that it's bad or "evil" or negative, and 99% of the time are wrong, because most of the negative beings are Satan's enemies. What non-Satanists call "Demons" most of the time have nothing to do with our Demons.
By definition, they would not be called Demons, but there are beings and entities out there that are existent and as the nature of Earth encompasses many species, the Universe does too. Doing what's necessary in the path will absolve you from the circumstances of having any serious contact with the enemy.