Definitely get the Knutsion book (The PL Bible). In addition, I'd also suggest you get "Smartwork for Retrievers" by Evan Graham. The Knutson book covers basically all you'll need to know about the pointing aspects, but it's weak (compared to the Graham book) in the other aspects of a Retriever that also Points.

If you are just going to have a "Meat Dawg" (Dandy Good Hunting Companion), Smartwork (vol. I) will suffice. If, however, you want the ultimate Lab that Points, you might want to also consider "Smartwork" vol II. If you're going to Force Fetch (I'd recommend it), also get the Graham book titled "Smartfetch".