How to get iPhone 5s into car speakers?

Like what do I need to be able to play my iPhone 5s in my car and how do I played in my car thank you

You go with a blue tooth connection or an auxiliary input cord.

Get a car stereo that allows Bluetooth streaming or has an aux input

Use a media Bluetooth kit, for music apps texting
this is the correct adapter

http://www.oemautosound.com/p-469-bluetooth-media-integration-kit.aspx