The thread groups up all of the packages released by this one author - not one thread per package as one might normally expect...so it's very scattered.
The defaults for the mumble install should work so long as you don't want fancy features like proper SSL out of the box. What sort of errors are you running into?
Default ports, pick a good superuserpassword (I believe it can't have any spaces in it), and start the container. I personally like using br0 mode where I can force the docker container IP address to something known that won't get clobbered on my network by the router dhcp server.
...then just connect with the regular mumble client. It will throw the error that the cert is self signed, and that's okay.