What is your definition of minimal effort? You do not just plant trees and sell them when they are whatever size you want to sell. Evergreens need to be sheared to a shape acceptable to your buyers, fruit trees need to be pruned to allow sunlight into the center for good production, there is mowing, spraying (depending on your diseases), digging (then purchasing topsoil to fill in the holes), watering if needed, marketing, and a whole host of considerations if you are planning on making a profit. Talk to a few Christmas tree growers and/or a few nurseries to see how "minimal" the work will be and be profitable. Might be more profitable to cash rent your land to a grain farmer depending on your location and needs. It is your call, but gather as much information as possible before making a decision. Good luck.