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