Polk TL1600 5.1

I’m not that tech savvy so just opened our new system and see it appears to need wiring for speakers. Why would they not come with everything needed?
Also as new to this home theater system world, I can’t find an actual full setup video anywhere for this system.
Do we need to buy the wiring and hook it up to the tv or cable box? Keep seeing stuff about a receiver....
Old guy confused here.