zz I actually read this book when I first started online, its a good book.
My personal opinion about the advice about playing limit is that it will cut down on your losses, when you first start playing, and if you only play the big hands to start with, the AA/KK/QQ/JJ etc, and limp with small pocket pairs, then you will do alright till you're ready to experiment.
I have little experience of limit, but I heard its 'purer' than no limit, as you have to play the cards/person more, theres less variance, and bluffs etc, thats my own personal thoughts, ok.
but, if you cant wait to jump into NL holdem, then play the play money tables and freerolls
(CC has excellent ones, 50 quality posts is the requirement) and experiment there, I still donk in freerolls just for fun, to try new plays, etc.