1). You can convert your bmap to a normalmap with a converter. For instance,
ATI Normalmap gen , or a plugin from NVIDIA for Photoshop. Then just either load it as is in a mtlSkin or as an entSkin

If you don't want to use a third-party utility to convert to the normalmap, you can just load your greyscale bmap as a mtlSkin and pass it through this command in your script:
bmap_to_normals(mtl.skin1,2);

2). As Alexander said, it depends on the effect you are trying to achive as to what one you want to use.

Here is an effect file that does simply a little specular type thing with a lightmap. Nothing fancy but it does something.

Code:

---

 ///////////////////////////////////////////////////////////////////////////
// Steempipes cheesy attempt at a very basic specular lightmap
//
//


material mtl_simpleshine
 {

   
   effect = "
	    	
     	texture entSkin1; // The Specular Light Map in a greyscale 24bpp format
     	texture entSkin2; // The Base Skin Color Map in RGB 24bpp format
			
      	technique simpleshine
        {
          
        	pass p0
        	{
	
	
		magFilter[0]=linear;
		minFilter[0]=linear;
		mipFilter[0]=linear;
      	
		magFilter[1]=linear;
		minFilter[1]=linear;
		mipFilter[1]=linear;
	

		Texture[0]=<entSkin2>;

		ColorArg1[0]= Texture;
		ColorArg2[0]= Diffuse;
		ColorOp[0] = Modulate;  
			
		TextureTransformFlags[0] =count3;
		TexCoordIndex[0]= CameraSpaceReflectionVector|0;

	

		Texture[1]=<entSkin1>;

	
		Colorarg1[1] = Texture;
		ColorArg2[1] = Current;
		ColorOp[1] = Add;  
			
		TextureTransformFlags[1] =count2;
		TexCoordIndex[1]=1;



		} //End of pass

	} // End of Technique

"; // End of Effect

} // End of Material


/////////////////////////////////////////
//  Action to Assign Our Entity
//
//
Action  Simple_Shine
{

//my.unlit=on;
my.metal=on;
my.material=mtl_simpleshine;

}


///////////////////////////////////////////////////////////////////////////////
// End
//
// 

---

The base skin:


The Specular Light Map:

Here is just the skin:


Here is with some speclight:



Because of the "CameraSpaceReflectionVector" the speclights will move with the view.