vampire horror film story board

The story for my horror film starts off by a man getting approached by a vampire while walking down a dark street late at night whilst  he is walking he is walking a vampire bites his on the neck and leaves the boy to bleed out on the floor. The man who has been bitten gets up off the floor and attempts to walk to some ones house to get help and stop the bleeding. He arrives at a familys house and the family immediately help him and put a tea towel on his neck and try to stop the huge amounts of bleeding on his neck. The family call 999 to get the man some help. Whilst the ambulance is coming to the house the man transforms into a vampire because of the bite on his neck and kills the whole family. At this point the video goes into pitch black and all you hear is a loud scream.