Your route .
Rome — 1 night stay
Arrive in Rome airport. Get transferred to your hotel..
Train ride to Sorrento
Sorrento — 3 nights stay
Checkout of your hotel. Take the train from the Rome to Naples. On Arriving take the underground train to Sorrento. Check-in to your new hotel..
Train ride to Milan
Milan — 1 night stay
Checkout of your hotel. Take the underground train from Sorrento to Naples. Take another train from Naples to Milan. Check-in to your new hotel..
Take your flight back to India. Hope you end up with a lot of memories and a few souvenirs too..