Since they didn't come with any cables, how can I get them to directly hook to a computer or iPod to play music?
What cables or what do I need in order for the speakers to produce music?
You would need to get a receiver or an amplifier. Hook up your iPod/CD player/tablet to the amp, then run the speakers. However, the amp would need the proper speaker connections to work or you'd have to rig something up. Receiver would be best option.