Make something from wood maybe furniture or a ornament and advertise it. Get your business a name put it in your local paper. Find somewhere to show off your wares that you have created start off cheaply to get things started.
If you want to start a legitimate business, you're going to need to get licensed as a contractor. Each state has a board that will evaluate your experience to make sure you qualify. Then you'll need tools, insurance, and an advertising plan.
Hire out as a general handyman or repair helper, whether cutting firewood or sanding down decks. When you have serviced these customers - who are now happy with your general skills - inform them you can do more complex work, as well.