The problem with this rose tinted pastoral view is that you (likely) have zero experience in agriculture, so this just isn't a realistic goal. Not to mention that small farms are basically razor thin in terms of profit margins.
Making assumptions is fine, just be wary that you could be completely wrong.
Check out the open source field robot project by Twisted Fields: https://community.twistedfields.com/t/january-2023-update-ne...