So you got one step further, congrats!
Now you need to set up apache so you can view your nextcloud in a browser, and contact to it via the client. For a local installation, the standard installation may be enough, on an internet server you need a virtual host:
That depends… Is it working now?
And sorry, I don’t want to come across rude, but I think you need to learn how to install and maintain a LAMP stack on the OS of your choice, in order to run a manually installed Nextcloud instance. Otherwise you might be better off with Nextcloud-AIO or the Snap Package.
It’s all working now. Thank you for your help.