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If the paint is flaking in one small area, it will probably extend into a larger patch, so ideally it would be best to scrape and sand away the flaking areas. Once you have exposed the underlayers, you can apply a prime and repaint the area (once dried).

You can paint directly onto the paper in theory, but it all depends on how well the paint applies to it. You may want to test a small area of the paper with the paint first to test, then go ahead and cover the rest of the wall.

As Stoyer and zenemu mentioned, it is probably best to try to gentlely wash the wall down first as the wallpaper may not stick properly if it's a dirty wall. If there is lots of bumps and holes, you may be best replastering the wall first. If it isn't too bad then just use lining paper to...