While many woods can be used for carving, there are some clear favorites, including Aspen, Basswood, Butternut, Black Walnut, and Oak. Because it has almost no grain and is notably soft, Basswood is particularly popular with beginner carvers. It is used in many lower-cost instruments like guitars and electric basses. Aspen is similarly soft, although slightly harder, and readily available and inexpensive. Butternut has a deeper hue than Basswood and Aspen and has a nice grain that is easy to carve, and thus friendly for beginners. It's also suitable for furniture. While more expensive that Basswood, Aspen, and Butternut, Black Walnut is a popular choice for its rich color and grain. Lastly, Oak is a strong, sturdy, and versatile wood for carving with a defined grain. It's also a popular wood for furniture making.
Sound overwhelming? Then just start off focusing on Disston saws. The Disston saws were manufactured by the millions and are the easiest to find, and most are of exceptional quality, especially the below common models. Remember to buy pre 1940’s era vintage hand saws. Here are some ebay searches for wood saws. To ensure that you don’t over-pay, when you’re on ebay click “sold” to see what they’re selling before and to see which saws are desirable. It’s fun research: