Having studied the paranormal through books, speaking with a paranormal investigator, and watching live demonstrations of supposed paranormal investigations - most people do not know what they getting into.
First of all, you are putting yourself in spiritual danger. Demonic possession is real.
Ghosts are real. Jesus spoke of them. But entering a house or building that is exhibiting paranormal activity could open you to potential attack and demonic influence.
I an totally unconvinced that any of the gadgets being used prove anything. If anything can be proved with gadgets, it would be all over the TV and scientists would be reviewing the evidence. Since science cannot study the supernatural/paranormal, there are no official scientific studies that prove anything either.
I would talk to a priest first, before you go further, who would be best able to help with hauntings and other paranormal activity.
Peace,
Ed