So yeah..you still have two weeks to get your spooky on.  Plenty of time to wrestle your inner demons onto the page and add spooky sound effects.

There are a wealth of writing tools on ye olde internet to get you started.  I like using prompts sometimes to get me going.  You can find a TON of horror prompt idea generators in cyberspace.  I also enjoy using photos or paintings as prompts.  Find a creepy photo of a desolate barn or something and then imagine the horrors that lie within.

http://www.springhole.net/writing_roleplaying_randomators/creepypastaplot.htm

http://nanowrimo.org/en/forums/usa-minnesota-twin-cities/threads/69648

http://nighthagscorner.blogspot.com/2011/02/writing-prompts-for-horror-writers.html

https://www.google.com/search?q=horror+photo+prompt&source=lnms&tbm=isch&sa=X&ei=UCv5UYnYF4qqyAG1goGwDw&ved=0CAcQ_AUoAQ&biw=1024&bih=681

http://thehorrificallyhorrifyinghorrorblog.com/2013/04/03/inspiration-for-fear/