Thanks for the reply. I did find the video and followed the installation process. My domain name came with a new basic Joomla configuration.
I deleted these existing joomla files on my server and copied the entire unzipped Joomla Quickstart package to my server.
The next step is the actual configuration where I have to fill in details about the database and user and passwords and I just was not sure if I typed in the correct names and passwords etc.
I ended up with a non working website with some plain text only so deleted it all and have to start from scratch.
All tips are welcome 😉