Hey there,
You can get to your console through the Server Dashboard which you can find here. https://minehut.com/dashboard/home
Simply hit "Activate" on one of your servers.
Click "Continue" after watching the video for 30 seconds.
You can now execute any command in the server console.
Hey there,
You can use a plugin such SuperVanish to hide the player from everyone else. Just install the plugin and someone with permissions has to run "/vanish name".
Hey there,
You can change the text in the setting "Level Name" to edit the default world you spawn in. Change that text to the name of the world you uploaded and restart your server.
Hey there,
For versions, view this image:
For giving permission without OP, you can use a permissions plugin such as LuckPerms or PEX. I suggest using LuckPerms. View this image: