Welcome to NGA,
@Zkbtsure .
Pretty much anything you plant is going to require some sort of maintenance... if you plant small trees or bushes of any type you will, as Sally said, still have grass to control.
When you say you would "like to sell the trees," do you mean as living trees? as firewood? as Christmas trees?
To me, mowing an acre of grass would be less work than what an orchard or tree plantation would require -- but the orchard or tree plantation would give you a lot more return on the effort you put into it.