>>74031>>72177To start with, any steel will do.
Then you can spend some money for some proper steel once you got a hang of it all.
I'd love to make a copper knife, I will totally give it a try.
>>74056Only in leather.
The basics are to have a good strong and long needle and to soak the leather in water.
There's probably many videos on youtube that explains more.
I made pic related a couple of years ago.