If you have worldedit select the area you want trees in and do //forest
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I would not assume so.
The Superflat generator does not spawn ores. It's intended for building on in Creative mode.
Click the button that says: World Type: Default, and it will turn into World Type: Superflat. Then create the world.
To make a superflat world with sand, click "Create New World" in singleplayer and then select superflat as your world type. Click "Customize" and then click "Presets." This allows you to select what kind of superflat world you want. Scroll down and then click "Desert." You can check out all of the other superflat world presets on your own if you haven't done so.
You just search. You can find one more easily on superflat by creating a superflat world and entering this map seed. 'pleasespawnvillage'