Good grief, that will be plenty of land for an "informal pistol range" just for yourself to use. That's going to be, what, 25 yards max? Just make sure there's either a hillside or a berm behind the target, to catch the bullets.
We have 25 acres, and I set up half a sheet of plywood at the base of a little hill (more of a rise than a true hill) to hang targets on, and shoot there all the time.
We're in a very rural area, and all the neighbors hunt and shoot. The last month before hunting season, it sounds like Iwo Jima out here...
So that's not an issue.
Your main concern, I would think, would be neighbors. Are they a bunch of misplaced yuppies that will have a hissy fit when they hear a gun going off?
You might also consider space, however, even if you could shoot on 2 acres. If you're on a very small piece of land, your neighbors might be very close by, even if they're on their own property, and your gunshots could be VERY loud and annoying to them, even if they're gun-friendly. Nobody wants to sit at the supper table with the neighbor's .44 magnum booming.
It depends on how the property around you is divided up. Or maybe you'll have 20-30 acres, but your range will be right next to the property line - and 200 feet from your neighbor's house. Step back and look at the whole picture.
Trees can help, too, if you can locate your range in a thickly wooded area; they'll absorb a lot of the noise.
Let us know what you come up with!