You can start with a kit. For example, this: http://www.madisound.com/catalog/pro...oducts_id=8307
(Zaph, designer, has a good rep!) Parts Express also has a decent selection.
So basically, you'll have to make the cabinets, which is a big part of the game. Gets you started pretty quickly and isn't too hard, basically have nothing to mess up. That's what I'd do for first build.
Or, you could do a subwoofer, buy driver, amp, again, the cabinet is again the main thing, not much to screw up
Either way, I wouldn't try to design the thing myself, just go with a tried and tested design, have fun!
Oh but you asked for books...... :\\ Well, you get get A LOT of info online. The book shouldn't be too bad, should give you the basics on crossovers, don't think they've changed that much, maybe some new types, for such as MTM, but 1st/2nd order, Ryley, etc. I think have been there for a while.