No templates needed at all!
You will have to look elsewhere for size of circles.
On my showing, this was followed immediately by a video on sewing hexagons by machine.
U Can Quilt 2, in 2013, Showed starting with a five inch circle and pressing each step instead of stitching. She didn’t say what size that made, but it looks like it might be an inch and a half side?
Nita posted this in 2012. The hexagon will be about half the size of the circle. I’m not sure if she meant sides or across the center, but I suspect the latter.
Otherwise, just experiment. Try Nita’s suggestion as a starting point for size.