A lot of times haunters do their haunt to a story that is made up or true in some fashion. Then from there the begin so draw up plans. There is no wrong way to haunt and many ways of doing it.
One thing that I would suggest is a book series by J.B. Corn. He was a pro haunter that passed away a while ago. But he wrote these books on haunting and I think you will find them a lot of help.
You can down load them from another haunter on this form. His name is "NightmareToney". If you search him in the forum, click the link to his web site and you should be able to find the book series on his home page. Or he will pop on and give you the link in a forum reply.