*** MINOR SPOILERS ***
After selecting Bonnie's chapter from the bulletin board simply go through the dialogue choices until you're forced to run. You'll end up at the bottom of a hill, and afterwards enter a corn field.
Push forward as often as possible, and be sure to duck left or right using the thumbstick to avoid the flashlight beams. I was never caught, but I'm sure it can happen.
After you reach the tractor simply HOLD the A button to grab the rebar pipe and move the thumbstick side to side to pull it out of the ground. Defend yourself, and after that there's a few more dialogue choices before the chapter ends.