To transfer the songs to your iPod, first download iTunes, the official Apple application used to transfer, update, manage and listen to songs. If you have a Mac, iTunes is installed by default, in Windows, you need to download and install it.
Start iTunes, connect the iPod, add the music to playlists on the left. Click on the iPod's name > Sync > Music and wait for the process to finish. And the music will be transferred onto your iPod.