Greetings skap22,
The music will need to be added to your iTunes library on your computer, and then you can sync the music to your iPod.
Check out those steps here: Import media from a computer to iTunes on PC - Apple Support
"Get media into iTunes
- In the iTunes app
on your PC, choose File > Add File to Library or Add Folder to Library. - Locate a file or folder, then click Open.
- If you add a folder, all the files it contains are added to your library.
Tip: You can also drag a file or folder from the desktop to the iTunes window to import it."
After the music is added to your library, you can sync the music to your iPod: Sync your iPhone, iPad, or iPod using your computer - Apple Support
Let us know how that goes.
Kind regards.