Docker Rancher for Development/Testing/Learning

Trying to setup a Docker instance of Rancher in a physical Ubuntu server, running ok but I would like to create a storage class and even if possible to deploy longhorn, I have unmounted free space in the server LV or I can use a host path, don’t mind either, but I cannot work out how to achieve the main thing that is adding the storage class and assigning any storage to it

Is there any tutorial about this?
I was expecting to mount a volume or similar when running the command or I am wrong

any given help will be very much appreciated

docker run -d --restart=unless-stopped --name rancher -p 80:80 -p 443:443 --privileged rancher/rancher:latest

it’ on the instructions, RTFM!