[cupofjoe]

In the bundle of wire, there should be speaker wires that go the various in-ceiling speakers in the home. These will need to be traced and labelled.

The appropriate wires are then plugged into a amp such as Sonos, which would be setup on a shelf or equipment rack in the basement. Typically you would install one Sonos amp per room of audio (zone). Sonos has built in services, both free and paid. You can control the audio services via the Sonos app.

You can also control Sonos with your Alexa / Google Assistant. The voice control is more basic than the app but is evolving.

This general description of what needs to be done. There are several different ways to achieve this with different budget points, goals etc.

Hope this helps.