You can see a video of this finger top here redirectingat.com/
I'm no expert turner but hopefully I show enough setup and a couple tricks to make setup and turning easier. This is one of my first projects and I have no training on a lathe so feel free to make corrections to any of my steps.
Step 1: Tools and Materials
As far as wood goes you will need a small piece of a close grained hardwood. I am no expert in wood types so I just go around picking up different types and playing with them until I find one I like. I dont know what type I used it was just a 2" log I found on the ground. As chipf mentioned in a comment make sure the wood isnt green, meaning its dried for an extended period. Green wood will shrink and warp as it drys making something that was circular when you turned it change shape over time.
*You'll also need a scrap piece of larger diameter wood atleast the size of your faceplate. You screw your faceplate onto this and glue your piece to the other side.
If you have a chuck then you dont need to do this, you can just chuck your piece of wood.