Then connect my computer via 3.5mm input
Do i play my music through the Sonos App on my PC or through ITunes(where my music is organised)?
Best answer by John B
To play the music files stored in your iTunes there is no need for the 3.5mm cable; your computer just needs to be connected to your network, powered on and awake. (Ethernet is preferably but wireless is also possible. )
As part of the Sonos set up you would tell Sonos to look for files in your iTunes folder. You could then select the music you want to play using any of Sonos' free controller apps, on desktop or mobile device.