Help with Volumetric Raymarching

I’ve been trying to follow along Ryan Brucks’ series on volumetric rendering using ray marching but I just feel completely lost.

It feels like there are lots of steps i’m missing even digging through all the recommended previous posts I can’t seem to get a handle on it. I’m trying to build some volumetric clouds like in his example videos. Are there any tutorials or walkthroughs that go through the whole process from scratch? Are there any working examples that I can import to get a better idea of how everything is supposed to function?

here you heave the shaderbits gdc plugin: with examples and materials:

and here you have a live stream showing how to use it: