Reddit mentions of The Master Bladesmith: Advanced Studies In Steel

You've thankfully got a lot of resources available online to help get you started. A good beginners tutorial can be found here on how to make your own custom knife from scratch with minimal equipment.

I tend to use Jantz Supply for a lot of my supplies including steel and kydex.

I'd highly recommend joining up for free on Blade Forums and browsing around the shop-talk forums. Tons of useful information by people that are just beginning and people who've been doing it for decades.

There's really tons of material online to help you figure out which steel to use. If you're just starting, I'd recommend sticking with something simple like 1095 high carbon, maybe 440C stainless. Here is a surprisingly good article written about it from an unexpected place. If you get the chance, pick up this book: The Master Bladesmith by Jim Hrisoulas. It's practically the knife-maker's bible.

Good luck and don't hesitate to ask questions!