Learn The Work
I first started learning The Work in early 2005. I like listening to books, here's a link below to download the Loving What Is audiobook from Audible.
If you don't have an Audible account you get your first download for free, you can cancel your account straight after if you want to, and keep the first book you downloaded.
You can also buy Loving What Is in paperback copy too.
There are hundreds of Byron Katie YouTube videos online, simply search 'Byron Katie' to see them all.
In October 2005 I went across to America and completed Byron Katie's school for The Work, I found it extremely valuable.