You can start here.
Consider reading it along with the actual book, maybe in PDF form like I do.
You can use Z Library or Anna's Archive to download the five books.
The narrator does this for free and is much better than Roy Dotrice's narration, imho.
This is my second read-through; last time was in 2007 or 2008.
I found YouTube links in your post. Here are links to the same videos on alternative frontends that protect your privacy:
Link 1:
Link 2: