Here is a YouTube from Matt Shea from October 2017 where he learns how to farm. It's not wheat and hay, but it's what you need in Autonauts to make bread and pies. Since that video was made, the game has changed so that to make bread you don't use a Clay Furnace but instead use a Crude Oven, and you don't make the bread burning poles in the Clay Furnace but instead burn sticks in the Crude Oven..
