No one has mentioned water - a big an somewhat expensive issue for our farm. We use drip irrigation, but we have to pump off a creek. Dropping a well or digging a pond are both hugely expensive, so if you have a source of water nearby try to use it. Also, I don't know if you have pests like deer around, but we had to build a deer fence around our field. It was relatively inexpensive, using only wires space a foot apart attached to wooden posts and charged with an electric fence charger. It might be good for you to try to visit some nearby organic farms to see how they do things. Usually us organic farmers are happy to share our secrets.