Yeah, you connect your iPhone to the PC with a cable and sync songs and apps to it. You can do it all through the phone though.Thank you very much but there are somethings which I say:
I'm from Iran and though I paid for that iphone but probably can't make an apple ID unfortunately. what should I do so?
And, for seeing and choosing an app from "app store" icon on iphone, it should be connected to the Internet. yes?
And about that itunes that I'm downloading it from that link you gave me, what should I do with that? I should install it to my machine (Windows 7) and try to connect with it to my iphone by cable, yes?