The best way to make a million dollars building canoes is to start with two million...
As Paul pointed out, the only traditionally built all-wood canoes with no fasteners are dugouts and birchbark. There is no market whatsoever for the former (and they are a lot of work to make), and the latter have a steep learning curve.
Among "carpentered" canoes, the cedarstrip/epoxy/glass and glued-plywood-lapstrake are the easiest to learn to make, but as books and plans are heavily marketed towards the home-builder, you have to not only learn to build impeccable canoes, but add something that sets you apart.
Beyond that, you are looking at significant investment in learning a construction technique and/or gearing up. For example, building a mold for a wood/canvas or traditional cedar strip canoe is more work than building the boat itself.
Your best bet may be to learn how to restore canoes. There always seems to be a demand for that, and you can be up and running with less investment in education and tooling up. At the same time, you can be reading up about construction techniques. Reading lists for some methods are here:
http://forums.wcha.org/forumdisplay.php?71-Wood-Canoe-Basics
In addition to those, "Canoecraft" by Ted Moores for cedarstrip construction, and both books by Greg Rossell for traditional methods are recommended.
Parting shot: A well-known canoe builder just won a million dollars in the lottery - when asked what he was going to do with the money, his response was "keep right on building canoes 'till the money runs out..."