connecting Android Pad to car for music

Hello, I am totally lost. I just want to listen to Internet music stations on an Android tablet offline.
I was told that I would need a modem in the Android Pad to listen without WiFi. For example, “iHeart” Radio says you can listen to music without WiFi.
I have Bluetooth, but I still am lost. I have just a flip Phone so I can’t use the phone.
Any help would be appreciated as to the easiest way to do this.
Thanks

I didn’t find the right solution from the Internet.

References:

https://www.cnet.com/forums/discussions/connecting-android-pad-to-car-for-music/

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