Left 4 Dead 3 FanFic: First Blood

Howdy! I'm a rookie writer and this is just a pilot of my Left 4 Dead fanfic, i'll delete it later on for revisions. Set 4 weeks after the first infection. 4 survivors found themselves in the hellish apocalypse, and they have to overcome challenges and survive. New characters, new places, new special infecteds, and new challenges. I'm open for your suggestions and criticisms!