Your Sony should havecome with some type of software to allow the transfer of your movie files. If your Sony manual says it uses USB you can find the cables at Walmart Best Buy Circut City or any camera or computer supply store.

I don't know what operating system your computer is using but when you hookup the USB cables from computer to camera and turn on the camera the computer should give you some clue it has connected.

If the Sony uses a Firewire connection you will need a Firewire card installed in your computer they are found at the same places I posted above.

Good Luck.