This is what you start with, the Head Casting Kit from Mike Brose.
He looks kind of spooky, doesn't he? Don't worry, he takes on a life and character of his own as the project progresses.
The kit includes a jaw, head shell, trapdoor, a baggie with some brass tubes and a rod, and sheets of instructions. The brass parts are the axle for the jaw.
You can also get a pair of Pro Ventriloquist Dummy Hands . Or you can make your own hands. Details are found at the Hands chapter of this document.
These hands kind of look like the ends of a large person's back scratcher just now, but you'll make them look real when you get to Painting the Hands.
You can also get a pair of Pro Ventriloquist Dummy Feet...
...and Pro Vent Figure Eyeballs...
...and a Pro Ventriloquist Dummy Body.
Read the instructions carefully. Also read Figure Making Can Be Fun cover to cover. When you think you are ready, get started.