Toyota 2004-2009 how to get there USB to play music

Hello, i bought toyota prius 2004 recently, I would like to get there somehow USB/SD card slot to play music, my prius has GPS navigation with bluetooth but i cant play music only make calls there.
I saw few topics after searching in Google, but this all seems to me old. Is there something what you could advice how to do it? I think best would be add there some autoradio like i did it on my previous car Suzuki Alto, where i simply used radio for 30 pounds connect few cables and it was done USB/MP3/Bluetooth ...
But with this prius is tricky stearing wheel remote controls and what i saw it may stop controls of ACC...

Can you give me some guide for this? If it is here already somewhere mentioned please give me adress to topic because i was not able to found it.
Thank you for your help.