Looking for a course on 3D Farming

Hello all,

I have searched on Udemy and youtube and have not quite found what I was looking for. I was hoping to find a course on how to implement farming in a 3D game similar to a game like Medieval Dynasty.

I have seen one course that was interesting, but I found myself confused and was hoping for a more organized and detailed course. I was hoping I was not alone in wanting to see a course on implementing a farming mechanic where you can place a field in a suitable area, and then proceed to till, fertilize, seed, and harvest the field. I understand the basic concept, such as needing a state machine to control the current state of the field, however I am struggling on wrapping my brain around how to determine if you can place a field to begin with.