From personal experience, I would recommend beginning your research with one or more of the many books and videos on Knife Making! They are full of valuable information gained from years of hands-on practice by some of the finest knife makers in the world.
They are full of How-To, show many photos, etc.
Catalogs are full of videos and books on knifemaking theory and practice. Read the books.
Watch the videos.
Put what you learn into use, and learn from your own experience.
That's how we learned.
I've been making knives for almost 10 years, and just got a new DVD today. It never ends, but first, you need to START!