I don't want to sound like a jerk, so no offence but maybe shaders is not the best thing to start with.

Anyways, doesn't matter, try to search a bit on the shader forum and look at some codes. Although you might not understand the code itself, often it is explained how to implement the shader in your wdl script.

Edit: Okey I did some further searching for you, and this is what you are looking for I think:

Rhuarc's Normalmapping shader

It's all explained how to implement this too, just make sure you have updated to A6.31 or higher, since this is a DirectX 9 shader,