We are ready to order.
OR-di-na-re — four syllables, stress on the first syllable of 'ordinare'.
Use this to flag down the waiter when your group has decided what to eat and is waiting to order.
'Siamo' is the first person plural of 'essere' (to be). 'Pronti' is the plural form of 'pronto' (ready). If you are alone, say 'Sono pronto/a per ordinare'. This is more polite than simply calling out the order.
Possiamo ordinare?
Can we order?
Slightly more interrogative — fine when the waiter passes by
Sono pronta per ordinare.
I am ready to order.
Feminine singular — use if you are a woman dining alone
Quando ha un momento, vorremmo ordinare.
When you have a moment, we would like to order.
Very polite, used when the waiter is busy
Italian waiters do not hover or rush you. It is perfectly normal to sit for 15–20 minutes studying the menu before anyone comes to take your order.