First you need to unlock all farm field rows (all 3) then buy/find Might seeds 3 of them then talk to the head farmer and plant all 3, then choose the amount of cycles you want (the more cycles the more money you will get but you have to pay 800 resource points each row that 2400 points) but you will get around 13000 more or less. Then when 1 cycle is done (1 game day = 1 cycle)go back to the farmer and get at least 3 more to plant again then sell the rest then walla MONEY!
ask if you have any questions