front parking sensors, upgrade ecu,mp3 takeoff

Hi, folks I bought a 2006 1.9pdi 4x4 today and I have a couple of questions.

The car has the factory rear parking sensors. Can the front ones be added and, if so, can I get the wiring information?

I am sure this has been covered, but what is the recommended ecu upgrade - primarily for economy, but an increase in performance would be nice as well

There is no mp3 plug. Is there a way of adding this?

Is mine a mk 1 or mk2, and can somebody explain the difference?

Thanks for your help and please forgive my ignorance