Buy a book its always nice to have something to fall back on if you would run in to problems.
I bought myself CSSMastery just before christmas and it has helped me some, and it brings up some usefull topics and common hacks that is needed today.
This isn't really beginners guide, but you could always get another one to go along with it
I know this isn't what you where asking but i tell you its totaly worth it and its not expensive at all.