Just got new iPhone, HOW DO I.......?

So I just got my new i Phone tonight and I am wondering how I can use it in my car.

How do Plug it in my car?

I have heard there are some issues using i Pods and i Phones in our cars but is it a real problem. I can't find a port to plug into. I have heard it is in the back of the radio and hard to get to so HOW DO I...

plug it in?
Use it in my car?
Any hardware I need to buy to make this work?

Also does it cost a lot, any way to get the stuff I need cheaper but not sacrifice quality?

Also what is the easiest way to do this?

I have a 2006 Mustang GT

Any info I have not yet provided just send a reply and I will read it on a regular basis and reply ASAP!

Guess I should say that I have the shaker 500 in my car and did not find a port inside the console. Correct me if I am wrong but 07 and up only had the port inside to middle console?

If so I have an 06 and no port in the console, What do i do?

Thanks guys!!!

I really don't want to go with a different head unit right now! The money is the issue.

I did however discover the I have the Motorola ROKR and it is designed to be a blue tooth unit to use for phones so that you can hear the person you are talking to coming out of the speakers of the car or the small speaker on the unit its self.

I simply turned on me blue tooth on my phone and synced it with the ROKR and set my radio station just like I would for phone calls and selected iPod on my phone and it does go through the car speakers.

One down fall to this though, I get a static sound in between tracks but it did that even on phone calls. I don't hear any static when the music is playing, I think that it is because the music simply drowns it out. I am sure it is still there but it will work great until I do get the money to get a new head unit.

AGAIN THANK YOU ALL FOR ALL THE HELP!!!

Just out of curiosity any good head unit that isn't that much but has a big screen and good iPod controls?