Well, first of all you dont apply the lighitng in the pixel shader.. you cant just calculate the color in the vertex shader and expect it to do anything if you havea pixel shader. You must multiply the pixel shader result by the lighitng. To do this you have to modify your pixel shader inputs to include the color0 data. Then you multiply the result by it.

However, this is only going to add vertex lighting, and doesnt have anything to do with why the gold shine effect doesnt work. The model ought not to be black in any case. The reason it is black is that you multiply the final result in the pixel shader by a constant called "Gold", when in fact you don't actually define this constant's value anywhere, so of course it has a default value of zero. And you know that you multiply anything by zero you get .. zero. Which is black.

delete this line: float4 Gold: register(c0);
and replace it with something like this:
float4 Gold = float4(220.f/255.f, 200.f/255.f, 0.f/255.f, 1.f); //this is a rgb color for you... change it to suit