Ciao Silvana!
Thanks for being part of the ItaliaPass community.
That's fantastic that you are planning to rail IT ™ :-) !!
Yes - for sure it will make sense to buy before you leave - prices are lowest and seat availability (important for a big group like yours) is better.
I'd like to set you up directly with one of our Customer Experience experts to help you with all this - we also have special pricing for ItaliaPass members that we are working on and will be able to extend to you.
As to the rail pass question we will analyze your itinerary and figure out based on where you are planning to travel whether a pass or individual tickets makes the most sense.
My email is mike@italiapass.com8 - please send me a note when you can and I will get the ball train rolling (ugh! I know).
FYI - the summer train schedules have not been released yet but will likely be soon (next 2-3 weeks) so best to plan now and book as soon as they are released. If a rail pass ends up being the best option we can book that any time.
Mike