If I was a person considered normal by society and wanted to know about contact with the other side, the first thing that comes to mind is talk to a schizo. Schizophrenics are famous for their communication with so called ghosts and demons, dieties, etc. Many think that they are Jesus or the re-incarnation thereof. Why is this anyway? There is the famous saying that a psychotic sinks and a psychic swims in the same ocean. A psychic meaning someone who has the schizophrenia gift, but it doesn't act like a disease so much. It is like this gift has a light and dark side, one being communion with the other side, but this can result in being psychically dumped on with nonsense and psychosis versus knowingness and psychic skills.
People who have psychotic breaks often gain control of their power and become powerful psychics. Such is the case with shamans for millions of years, the medicine people were often in contact with the spirits, and would be considered schizo by doctors nowadays. For me I had dieties come through and their into was quite dark and chaotic but they began to give me knowledge. Once you get though their test they power you up with their skill and knowledge. You unify with the diety. I would consider this the light side of schizophrenia, where it can be classified simply as clairaudience, clairvoyance, clairsentience, etc, rather than the psychic garbage dump that dieties do to cause what docs treat as the bad schizophrenia. For anybody here fearing they are loosing their mind with visions, etc, just realize that it is most likely a shamanic initiation. Put it in that context. It's not bad, once you get through it.
For me, I get what the hindu call kriyas, mudras, spontaneous meditation postures, etc. It is considered a disease by modern psychiatry, and it does interfere with my life since I can't control it. However, I channel chants, and see visions at random, and these often time have info that is either telepathic or future prophecy that proves itself as it comes true. It's not all crazy. However these spirits follow a pattern and teach that if you are not detached from belief in them they will look at that as an opportunity to cause a bad or false one. They are obligated to prove themselves, any diety or spirit. Don't fall for the tricks.
If you ever get a chance, talk to a schizo! Often times these people end up homeless because society rejects them entirely. I have had some great conversations with the haunted homeless. Don't fear their fate is what I learned. There is a spectrum with seeing the other side, and it can drive one mad, but most likely the statistics show that you can manage the trances and visions and master them. Most people learn to handle their shamanism.