How do i connect my rant to my computer?

I just got the samsung rant %26amp; I heard u can download music from ur computer but i dont know how to connect it? Is there a usb cord i need? %26amp;%26amp; Does it cost money to download it right off my computer? %26amp; If i wanted to get free ring tones what is a good website %26amp; how does it work do they need my number or what? How do i connect my rant to my computer?
the fone comes w/ a usb cord.

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