I'm with Tod and Paul. The primary reason some canoes have keels is related to either the need to protect a fragile bottom (like on many old wood canvas models) or because it provides structural support or otherwise aids the manufacturing process (as in many plastic and some fiberglass canoes).
If you think about it, a 1 inch keel really doesn't provide a lot of extra resistance to sideways motion--the canoe is probably already drawing something like 3 to 6 inches of water, depending on how its loaded. Adding 50 pounds to the boat may make as much difference as adding a keel.
As for bent paddles, I'd save your money unless you're planning long trips where speed is important, and you intend to become an expert paddler. They do offer some advantages for efficiency and speed in the hands of experts, but they are far less versatile for those of us who are more likely to be worming down a narrow twisty channel with a partner in the bow than we are to want to make a 5 mile lake crossing before breakfast.
Find your local chapter of the American Canoe Association and see if they offer a nearby paddling course. Universities and adult ed programs (especially in canoe-rich areas like the Adirondacks, Minnesota, and Maine) also offer classes, as do many canoe/kayak shops. You'll learn a lot faster with a good instructor than you will on your own.