A little difficult to answer without knowing your current skills or how much initial investment your planning on, but I'll throw out a few ideas.

If you can weld, welding shop.

If your skills are more towards woodworking, get a half decent tablesaw and start making cutting boards, wooden signs, and small crafty type stuff. It's amazing what people will pay for little stuff like that, which require minimal skill and time to make, and materials can often be sourced from scrap lumber.

Since you're close to an urban areas, power washing, window cleaning, or Handyman work.