Pretty much ditto on everything above. Internet forums can be a wealth of information. This one, Bladeforums, Knifenetwork forums, DonFoggforums...there are many. Although they can also sometimes be a source of misinformation (as can anything on the net!), they are great for getting general ideas, picking up tips and meeting tons of knifemakers out there. There are lots of books out there as well as videos. U-tube even has quite a few videos by some great knifemakers.
Shows are excellent. Nothing beats taking face to face with someone about their knives. Most knifemakers love talking about how they do things. If you happen to be in the TX area, I'm a BOD member for the TX group and we have a show coming up mid July in Roundrock, TX. If you (or anyone else here) wants some weekend passes, shoot me a message. Many makers have "open shop nights" or weekend gatherings where knifemakers get together and swap tips tricks and general BS.

More formal instruction is available from many makers as well as a knifemaking school put on down in Texarkana by the ABS (American Bladesmith Society) and Texarkana College. Costs will vary on these.
After checking out all the info you can find, you'll no doubtedly be drawn to a certain style or method. Don't hesitate to send out some emails asking for direction. As with any hobby, you'll need a bit of equipment. For knifemaking, this can be anything from a drill press and few files...to hydraulic presses and molten salt furnaces.
Be prepared...once the addiction starts, it never stops!:)
P.S. Knife kits are a great way to get started as well.