First, read
Understanding Exposure as recommended. Its very light on the details, but the first read is just to
get the big picture (no pun intended). Then maybe something like
Exposure and Lighting to learn the mechanics of photography and some technique. My guess is that you'll learn more from that book than in a
dozen Kelby "tips" books (which are also good and have their place). Then go take
lots of photos (I'm talking in the thousands). Then re-read Understanding Exposure, this time to get more ideas of how you want to manipulate the exposure triangle (shutter speed/aperture/iso) to get the shots
you are looking for. Then go take
lots more photos.
If you're thinking that's a lot of pictures, you'd be right. I have Apple's Aperture and Adobe's Lightroom to manage my photos (I prefer Lightroom but either is fine). So now that's the cost of the software plus another book or two* and the time investment to learn how to manage a boatload of photos and how to correct a number of problems in what they call "post production". You'll also want at least one good strobe that will work off-camera, if only for fill lighting outdoors and bounce lighting indoors. This is really a must have, IMO.
Once you get that far... One book I really,
really like is
Light, Science and Magic. It's really more of a textbook than anything else, but it'll get you thinking in terms of capturing light instead of capturing a photo. If you find like that approach, you can hit the Strobist.com blog for a *lot* more ideas and examples of using common strobes to get truly professional results.
Good luck, and remember to enjoy the journey.
* My advice is to get at least one of the Lr books that let you download the author's "before" images so you can follow along with the author when doing PP work in Lightroom or Aperture. Kelby's Lr 2 book is a great example of this, though I'd read Nat Coalson's Lr 2 book first as its heavier on photo organization which is vital to using Lr effectively.