Italy travel tips and information?

[andrew]

Hi. I'm 17, and heading for italy with a couple of friends this summer (july 2010). Need help and information about a couple of things. Would be very happy for every answer!

1) Anyone who can recommended the cheapest way to fly to Rome or Pisa from Heatrow or Manchester?

2) As said, i'm 17 and wondering if anyone knows if it's legal in Italy (Florence and Rome) to stay at a hotell if you are a minor?

3) Any good male vintage clothing stores in Florence?

Thanks a lot!!