The manual? I have Photoshop CS, and I have to say that I haven't really touched it. XD Yes, it probably is useful, but you can pretty much get all the information you need from tutorials on the internet. What I do, though, is buy some.... guidebooks, I suppose you could call it. The two series that I've been sticking with is "Visual Quickstart Guide" and "Bible."
The program itself isn't hard to use, but, as you said, you're a beginner, and I remember that when I first started, it was fairly challenging.. of course, you can always get help. ^^ You can check out these tutorial sites:
http://good-tutorials.com/
http://www.n-sane.net/
http://www.tutorialman.com/
Just three of the many good sites for Photoshop tutorials. As soon as you get a hang of the basic functions in Photoshop, you should do fine. ^^ Then, you can start exploring with all the more advanced functions..