How does the Italian language show a question? Do they use an upside down question mark at the beginning of the sentence?
Italians do not use an "upside down question mark at the beginning of a sentence".
Most of the punctuation in Italian is just like punctuation in English. When forming a question in Italian one simply places a question mark at the end of the sentence, for example:
Scusi, parla inglese?
Excuse me, do you speak English?
I hope this helps!