Help with car audio setup?

I have a 2014 Ford Mustang. I'm planning on upgrading the audio though soon and I'm kinda new with upgrading my car audio. I was wondering exactly what I should be looking for when it comes to getting a more crisp, rich sounding audio and also a better punch when it comes to bass. *Lists are preferred!

Kenwood, Pioneer and Sony all makes quality head units.

You will also need to upgrade the stock speakers and get a 4 or a 5 channel amplifier to power them. If you don't, then there will be NO improvement of your system.

For bass, you need a subwoofer. It's a small vehicle, but you should be able to fit two little 10" woofers up in that Mustang if you wanna go with two woofers. Some quality woofer brands are Soundqubed, Sundown Audio, DC Audio, JL Audio, NVX Audio, Alpine, etc.

Some quality speakers like 6.5 and 6x9 are Rockford Fosgate, NVX Audio, Pioneer, Soundqubed, etc.

Some quality amplifiers are Rockford Fosgate, Soundqubed, Pioneer, Kenwood, etc.