I want my child to get music lessons by a professional music tutor in Melbourne Australia. I am not sure about the best place to learn piano.

I really want him or her to be a great pianist, so what’s the best earliest age to take lessons.
Is 4 good?
And yes, I know, you’re going to say “Don’t force it into him if he doesn’t like it.”
Of course I won’t, but if he does like the piano, I want him to take as many lessons as possible at the earliest possible age.

In every grade in piano lessons, there are some usual pieces of music commonly used in the examinations so that one will have to get familiar with the pieces such as Fur Elise by beethoven. can anyone tell me some? i’m trying to find a particular piece. i know the melody but i don’t know the title, but it’s one of the common piano pieces.