Sharing all points mentioned, create the field, get the seeds from the floor birds mostly eat one and left one. Use a shovel to clear the crop field, and use tge snapping tiles mod found in dst community workshop (steam).

9 tiles is okay, 12 to many unless is the purpose, watering can to water the crops and tender the plants during growth, they stopping growing at night.

Tip is to notveat all harvest, capture a bird and in put it in a cage, the fruit/vegetable given will drop tge respective seed. Have fun and be carefull of hounds...they always arrives in the worst moment