To make the farm make an 11x11 square, pick a wall and make 3 blocks in the corners of that wall and build the wall up by 1 block, on the side you picked put 2 dispensers in the wall you just raised and put a water bucket in it and power them, where the water ends dig 2 blocks and hollow it out, fill the bottom block with ice, put 1 water source block in the block closet to the wall you picked in the block you have dug, to do every thing else look at the pic