Start with something where you know the tune very well already - for example "Sweet England" has the same tune to a song I sang at school called "When a knight won his spurs" So that was the first song I ever sang in public. Or sing something very familiar like "happy birthday to you" - it doesn't matter what it is you just need to match your voice to the tune.

That means you can concentrate on one thing at a time, learning to sing and learning italian at the same time sounds pretty difficult.