Wait, disregard. I don't want flat. It reflects light and looks shiny. I'll figure something out.
The normal map isn't what makes it shiny. That's going to be the Specular map.
Follow what Greebo said but... If you want to start without any bumps or dimples, etc. just make the normal map one solid color. Then you can see it without this stuff in the way and learn what makes it tick.
A color in this range works fine.
Normal mapping as implemented has some anomalies due to compression that will eventually go away with some updating on the graphics engine side (or something like that). Skuzzy can clarify so I don't misrepresent his words.