This has got to be a joke! Are you serious man? You don't know your own gear when you're asking what a telephoto zoom lens is.
I hope it's been mentioned already but you will probably need a fast telephoto zoom lens, which means: Fast as in, an f/2.8 lens for example, the nikkor 70-200mm f/2.8. Very expensive but it's ideal. cheaper version go for a sigma 70-200 2.8. Also I have almost the same body as you and do you know anythign about it? When you ask does it have the capacity for it? Do you not have an SD card? Because that's how much capacity my camera has 8GB of it. Learn your setup and your hobby before you mess around with somebodies photos. Especially WEDDING PICTURES!