I can help out with a few of these.
You can get cars
here by Muser
Download the animal mesh pack
here that includes the animals you wanted (minus the sheep, I believe)
Glave Has the hay, haybales, hay piles, hay stacks, hay everything, as well as buildings you could use for barns and also farming related tools/objects I'd suggest using.
Annnnnd I think that's about all I can do for you. So with those, you're lacking the humans and fire truck/station. Sorry about that.
