Once I made i dio with a farmhouse and some haystacks and i had that same problem... this is how i did it
for the hay I would take wisks from a broom, make them look like the scale you want, and get some clay and form it like a haystack
then paint it dark yellow with gold and lite yellow details, then glue the broom wisks to the painted clay
You could use thcik wire if you wanted a metal fence
You could use sprues or balsa for a wooden fence
for a well I take sprues and form the shape of it, then take some spackel or modeling clay and make the well... then i cut the brick shapes in it, then I paint it, for a buckte and rope, use thread and small thimble... dont use one with the hole pattern in it
for the water just take some caulk and fill up the cavity where the water goes
then take 2 kinds of gloss blue and use the darker for shadowed water and the light blue for the out of shadow water... then take some gloss spray and spray over the paint
if you want a cover for it use balsa wood and sprue for the supports and rafters
For the farmhouse use some balsa wood if you have some around the house... and make your farmhouse out of that