Playing music from my iphone in my car?

I have a 2003 ford Taurus SEL, and right now i'm using like a Casette i put in and plug into my phone and play muscic, all is fine and works great.
but I want a adapter that is able to charge my phone and play music, except i'm not really aware on where i plug this into. Is my car applicable for this?

They weren't available in '03, so there's nowhere to plug it in. You still want one? Buy and install an aftermarket stereo.