Hi. You should be able to find most info quite easily on the site or in the forums. When you arrive, just pick up a cheap prepaid Italian SIM card.
PrePaidGSM: Italy lists all of the available options. There is also plenty of information in the Europe subsection of the forum, as the same questions get asked a lot, especially about Italy.
As you would also like to use data on your device have a look at this thread:
http://www.prepaidgsm.net/forum/euro...ata-italy.html
Finally, for calling back to the USA I really would not bother with the Skype option. You will be better served with a Betamax brand with inclusive "freedays". (e.g.
VoipRaider). Usually for a 10USD topup, this entitles you to 3 months of free calling, and you still have the 10 USD to spend at the end of that. Besides being much cheaper than Skype, you are not restricted to making calls from your PC or VoIP enabled mobile as you can also chose to make free calls to the USA (or elsewhere) from your prepaid SIM at local rates via a local Italian access number.