Mariadb help for setup

I dont know how to make go. Ive installed Maria into a docker container. I made a base root password. Ive made the default starter nextcloud page launch. I now have to go create everything and I’m so out of touch on any sql stuff. Getting help creating and generating what I need and pointing out how would so help out right now. I’m so far lost! Help!?

Just install PhpMyAdmin, create a fresh database and a user and use the credentials at the setup screen of Nextcloud.