I only read Brunsons first book. I actually didn't even know he had a second.
Online is very hard to make money. It's a tremendous amount of guess work. You play the cards more than the player when you play online.
Dan Harringtons are also good. I have a couple of other books that I read. They are by lesser known players but still very good. One of them gets into very deep detail on percentages which I found extremely helpful.