My idea for a horror movie

Four friends driving through the woods, 2 couples boyfriend and girlfriend on the way to a big party/meet up in the woods. When driving along the way one girl starts to feel strange almost creeped out as she starts to notice stuff outside such as shadows and figures she tell the rest of the people in the car but they take no notice thinking that she is just messing around. They finally get to their destination where there is a fire burning drinks on the floor and bags but no one to be seen. They leave the site and try and look for others when they notice a light come on and follow thinking that it is the rest of their friends. The come across an old run down warehouse where they enter not knowing the horrors that are waiting inside. The door slams behind them where they are then left to fight for their lives from the horrors within who will survive.....