mp3 in Evoque (for beginners)

Hello! Normally I know how to help myself with technology, but the Evoque or its (“big” music system give me riddles. Also the user manual doesn’t help me; I don’t think I even found the right chapter. The goal is to hear mp3 in the car. Actually nothing special… Actually I had thought that such a system has a hard drive on which you can put mp3. But SCheint’s not to be given. Right? The VErssuch a few mp3 folders a I can’t see that an access would be made. Stick is FAT32 with 192 mp3s in subfolders. Shouldn’t that be possible? Alternatively, I would have an old iPod nano. Is this the better solution? What is this about the 10 CDs that can somehow read the thing? What does it do with it? Are you really talking about audio CDs? You already notice: Beginner’s questions! please so nice, and give me a hint in which direction I have to research. It wurds me that I can’t figure out myself. Thank you, Thomas