Hello, congratulations on setting your own server up!
To learn more about commands you can view
this reference.
If you want to make solo play easier I would recommend enabling bots which are pseudo-clients that can heal, tank, etc for you.
To learn more about bots and their commands you can view
this reference.
If you have any further questions, concerns, or issues, feel free to join our
Discord where we have thousands of posts for various things that you may encounter and for questions that you may have that have already been answered over the years.
Hope that helps.