If you can't get a composer or foley artist, you can go to google.com, and type in "Royalty Free Sound Effects and Music". The quality is pretty bad compared to what you would get from a composer and foley artist, but it gets the job done.
You could also do foley yourself. Again, not as good as a professional foley artist, but it works. Just to give you some ideas, in the film "Let the Right One in", they bit into sausage to replicate the sound of the vampires biting into flesh. In "The Crazies", they used water dripping on a tile surface to get the sound of blood dripping on tile. In another movie, they smashed a watermelon to get the effect of... I think you can guess.
https://www.youtube.com/watch?v=RKq911kcqLY
https://www.youtube.com/watch?v=pSZvs8hecI0