I pick a photo, make a copy, add a mask and when I use a brush nothing happens to the mask or the picture. White or black?

I pick a photo, make a copy, add a mask and when I use a brush nothing happens to the mask or the picture. White or black.

If I understand you correctly, you have
Opened an image, and copied the background layer. 
Added a layer mask, and finding that painting in the mask makes no difference whether you paint with black or white.
That is what you would expect to happen if both layers are identical.  To demonstrate, make a change to the copied layer.  Either change the blend mode to Multiply, or lower the opacity, or paint big red stripes across it.  Now when you paint with black, the red stripes will disappear where the mask is black, and be visible where the make is white.

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