For which command? What is the exact error message? Copy/paste or screenshot would help here.
This is totally doable by following the section “Publish ports of all services” as follows, from the musicbrainz-docker
folder in a VM shell:
admin/configure add publishing-all-ports
sudo docker-compose up -d
Since it is running from VirtualBox, you also have to set it up to forward the port 5432 for postgres at least from the Linux VM to your Windows host; See networking - How to access server running in VirtualBox from the host? - Super User.
Same as above: Without the full log, it’s difficult to answer.
You can check that the release sample has been loaded by running the following command from the musicbrainz-docker
directory in a VM shell:
sudo docker-compose exec db psql -d musicbrainz_db -U musicbrainz -c 'SELECT COUNT(*) FROM release'