I recommend several books (Score 1)

There are several people like Ben Radford, Joe Nickell and others who have long experience doing proper, scientific investigations of paranormal phenomena like ghosts. I recommend you take advantage of their expertise. Ben Radford recently published a book called Scientific Paranormal Investigation last summer that covers alot of the territory. It is highly recommended, available as a paperback & ebook. An older book by Joe Nickell & Robert A. Baker is called Missing Pieces. It was published in 1992 but of course much of what it says is still totally valid.