Society
It is incorrect to believe that everyone will be sociable and laid-back because Italian society is a little more formal than Northern European or English-speaking ones and can be more sensitive to problems of respect or lack thereof. You shouldn't encounter any issues if you are respectful and civil, but don't anticipate that the average Italian will be able to comprehend or speak English (except for young people).
Italians give their loved ones and close friends two soft kisses on the cheek as a greeting. Males also do. Remember to kiss the other person on their left cheek first, then go to the right, so order to avoid kissing them on the lips. In general, you shake hands with (or kiss, depending on the level of familiarity) each member of the group separately when entering or leaving a group. If the encounter is for business purposes, simply shake hands.
Giving compliments is a smart move while trying to build friends. The majority of Italians still reside in their hometown and have much stronger sentiments for their community than for Italy as a whole.