My two copper coins of currency:
I suggest having a "build up" kind of flow to your haunt. Starting off with something that doesn't appear that scary to the average person (i.e. office) and gradually get scarier and scarier.
Office
Staff Break Room
Mess Hall
Bathroom
Janitor/Boiler Room
Suggestion: Garbage Pit
medical storage room
Mourgue
Doctors Exam
Max Security Room Hall
Padded Cell
Shock Therapy
Suggestion: Lobotomy Operating Room
Death Row







