Restart

Hi Ajonesie123

Sorry you've lost everything ... (I'm not an expert, just another Mac user.)

Apple support has a page on this that may or may not help.

To see the right info for your Mac: see if you can choose which operating system you had, at the top of the page.

Erase and reinstall Mac OS

https://support.apple.com/en-au/guide/mac-help/mh27903/mac

To recover all your files from a Time Machine backup:

https://support.apple.com/en-au/guide/mac-help/mh15638/11.0/mac/11.0

About Mac OSA Recovery:

https://support.apple.com/en-au/guide/mac-help/mchl46d531d6/11.0/mac/11.0