SQL Database Issue

Hi,

Im a newbie so I ll probably say non sense things here but I hope you can understand my problem.

Situation:
I got this: “WordPress database error”. I cant login to my dashboard. I have a copy of my site on local I did with Duplicator.

What I want:
So I would like to erase whats inside my phpmyadmin database, erase my FTP files, and reinstall both with very basic stuff. And then install Duplicator plugin to restore my website.

I dont know:
How to reinstall a brand new files in my empty database (in phpmyadmin)?
I know how to install a new wordpress with Filezilla but waht about the database?