The Italian railway service offers an on-line buying service for Eurostar and Intercity tickets. It does not matter whether you want to walk or take a ride. The secret lies in the direction you take and how much you know about how to get there.
Most tourists start in the wrong places and end up getting lost.
You only have to book a ticket and arrive on time. The official taxis are white in colour with a 'TAXI' sign. Try by all means to use the official taxis to avoid being taken by strangers who claim to be taxi drivers. So, you have flown into the airport in Tuscany and are standing with your luggage in front of you. There are a lot of options available on how to get home.