Did you put the textures in the textures folder (aka in the same directory that your shader is pointing to) or did you put it in the "map" folder?
Also if you use implicitMap - you do not need to specify a sub-stage. Just remove the inner brackets.

For now I think it would be easier if you stick to regular textures that are in the vanilla pak and familiarize yourself with existing material.
Work through map tutorials and once you get your map actually loading in the game, you can step it up. Just do bit by bit. That might be better for starting.