There are a couple of books on the subject, but learning from a book isn't the best way to go. Ultimately Dimytri is right, an apprenticeship with a qualified togishi is your best bet.
Here's an alternative that may interest you. A smith named Michael Bell runs a swordsmithing school out of his forge. If you are not familiar with Mr. Bell, he is one of the best smiths in the USA IMHO. Right up there with Howard Clark. He has courses that teach almost everything involved in the start to finish production of a Japanese Sword. If I was in your shoes, that's probably where I would start. After the class, I'd get myself a couple of cheap blades and practice, practice, practice.
Here's a link to his 2010 class schedule:
http://www.tomboyama.com/2009/11/18/2010-swordsmithing-school-course-schedule/