Enjoy your trip - we spoke at last seasons match about the trip out there. Unfortunately we won't be going this year (new puppy means someone has to stay with him....) Trip across Paris is fine - RER tickets from machines on the way to the metro... I would pop out of Gare de Lyon to purchase some bread/cheese/wine/beer etc for the trip. Train is V comfortable and great views from big windows - bar isn't bad either. For those who smoke there is just enough time at each stop to catch a drag or two whilst the train is on the station - many do.
Looks like this season will be the first for many a year when we don't go to a away match - can't think why this should be

I'll be sitting by the side of a Surrey road next Saturday cheering the GB boys on.