Satellite Hook up

[Big Red]

I am sure this question will amaze people as to how little I know about Satellite hookups.
I have ports on the outside of my 5er that say satellite hookup and they look like you would plug in a cable, I also have a Direct TV HD Dish and a Direct HD receiver. If I hookup the dish to the outside port and hookup the receiver to the TV, does the satelite come through the existing TV cable? And how do I setup the receiver for the area that I am in? I have heard that when turning on the receiver it will ask for a zip code, is this correct?
Hopefully someone can walk me through this.

Thanks