You need a phono preamp to amplify and equalise the output of your turntable to match the line-level input on the Sony. If in US try Radio Shack, in UK Maplin or Richer Sounds. Ebay also a probable source.
You also need a cable to link the mini-jack on the sony to the RCA/phono sockets likely to be on the phono preamp. Luckily, you already probably have the standard lead that links computer audio output (mini jack) to other devices (phono sockets) -- like speakers.
Shouldn't be any technical issues but make sure the turntable audio earth lead is secured to the preamp to avoid hum.