What is your best suggestion for starting up a 4-acre farm?

You need to prep the soil/dirt. What is growing there now? I don't know too much about NJ but whatever route you decide. Make sure that the ground is even worth farming. Have the dirt tested and see where you stand. Your dirt is the main thing. Good luck. I lived on 5.6 acres in NM and we had different things growing. It didn't do well(because the soil was weak