Just starting out, I would try some 1095, (.95 points of carbon), or O-1 tool steel. These 2 steels are very forgiving on the hardening and tempering and if you make a mistake you can reheat to critical temp and try again. The 1095 is a spring steel and readily available through most steel suppliers. If you have a local machine or welding shop. Go by and introduce yourself and explain what you are trying to do. Most of them will let you piggy back some steel on one of their orders for a minimal fee. They may even have some scrap tool or spring steel for you to practice with. I started out using scrap to learn how to heat treat and temper and then went to buying new steel to make blades for selling. Hope this helps.
Alan B