In this video, Patrick walks through everything you need to know, to add basic lighting to your custom Node Material creations.
You can follow along here:
https://nme.babylonjs.com/
You can see the final result here:
https://nme.babylonjs.com/#HPSSWF
Helpful links to dive into Babylon.js:
https://www.babylonjs.com/ - The homepage: a great starting place.
https://doc.babylonjs.com/ - The documentation: knowing all the details.
https://forum.babylonjs.com/top/all - The Forum: the best place to ask questions and learn.
https://playground.babylonjs.com/ - The Playground: the place to experiment get your hands dirty.
https://nme.babylonjs.com/ - The Node Material Editor: the place to create stunning gpu shaders.