Changed my film idea

Over the christmas break I've decided I will change my ideas but keep the same theme of horror/murder.
The reason for changing it was I simply was not happy with my first idea and wanted to change it as i could not do the original location and some of the cast could not make it.
I've decided to set it in the woods and have a couple walking their dog through the woods and they then hear their dog barking and rush over to find the body of a person they saw walk through the woods at the beginning and said hello to.
The couple then rush around trying to find the way they came in from but cant find the exit, the camera then focuses out and you see the back of the murderer holding a bloody knife, this is when the title appears and the actors and other cast members names appear.
The camera follows one of the couples running through the woods, when the person stops and the camera is on the back of their head you hear heavy breathing and the person turns around and screams this is when it ends.
For this I will include a cast of three and a dog set in a woods, I will also include quite music in the back ground at the beginning just to set the scene but when the people find the body the music will stop and the sound of their breathing will be the main sound.