It really depends on how you want to start learning CSS, here is a random url that gives you a few key approaches:
I would suggest doing something like the beginning of the layout, finding out something like position and how it works, or deciding how you mentioned floats .
There are many possibilities to learn, and my experience is that you have to solve one element at a time.
Otherwise, if you want to start a fake proof, check out a video tutorial site like lynda.com (I know that many people scoff at it, but it's great for beginners)
Then again, if you do not want to pay tuition / video, google for your css themes.
I learned a lot from CSS Play: http://www.cssplay.co.uk/
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