:) Hi! Welcome! Perhaps reading some awesome stories will inspire you. I will recommend to you what I recommend to others, and I’ll second what Mitzal said about Dead Man Walking!
In this list, only Dead Man Walking is a zombie game/story but these are all awesome and inspiring:
BerkaZerka’s Dead Man Walking (Zombie Survival) is extremely well written [I managed to get the best possible ending!] and kept my eyes glued to the phone I use (though it does have violence/gore and some language), he has also got great puzzles and games (Some of which I have still not completed. They’re awesome!). Ogre11’s awesome works I have read/played so far include: Spy Mission (You gotta see the different endings), Cryogenic Failure (Again, you gotta see the different endings), UFO at School, Alien Abduction, Finding the Muse. Of EbonVasilis’s works, so far I have read his epic A Chosen Hero (I’ve got to read more of his works!). I have also played cMitchell3’s Get out Alive, read Will11’s true story Climbing Beyond The Clouds, read MinnieKing’s inspirational message Addition, and read the short mouse hero story by pinkalily21, Alone in the Forest. There are great writers and future great writers to be found on this site.
I wish you well on your story, and I hope you have an awesome time on the site!