Haunted House project status 10-20-11

So far, I'm having a bit of trouble with the project.

1. I can't decide what to start the interactive haunted house story with:

• It takes place from the user's point of view(first-person)

• Here is a possible opening: The user's car breaks down at night in the middle of nowhere during a bad storm and his/her cell phone has no reception. He/she tries to find shelter for the night, and comes across an old (mansion/house/plantation).
  

• I don't know if I need to go further or if I need to develop it more.

2. I'm having trouble deciding whether to use a mansion, a house, or plantation. Most of the horror stories I'm familiar with contain a mansion of some sort, Addams Family, Luigi's Mansion, Casper, even the Haunted Mansion(I hadn't watched the film or gone to the attraction yet).

3. Other than the following rooms:

• Bedroom
• Bathroom
• Kitchen
• Dining Room
• Front Entrance
• Attic
• Ballroom
• Wine Cellar
• Living Room
• Library
• Garden Maze
  

I don't know what else to add. I also can't think of how to make each room scary enough for the target demographic(18-34 years old). That's mainly what I worry about: keeping target demographic in mind.

If anyone knows of any recommended viewing of horror movies or can help me get an idea on how to make specific rooms "scary" or "spooky"...maybe along the lines of Vincent Price or something like that, please let me know.

Any help on this will be appreciated.