It looks like you are using a panel schedule template that is blank.
I would find Revit's "OOB" (out of the box) panel schedule, either in the default Revit Library, or in one of their default project templates (like the imperial multi-discipline template).
Open that template, and go to "Manage", "Panel Schedule Templates", and "Manage Templates", and hit the pencil icon to edit one. It should look like the attached schedule.
Then, with your project open, use "Manage", "Transfer Project Standards", and select "Panel Schedule Templates" to import that schedule into your project.
Then go to your panel schedule, and on the far left of the ribbon, choose "Change Template" to make sure the one that was just imported is selected.
That should get you going. Then you can duplicate that template, and edit it as needed for what you want to see.