I am flying into London. I will be there one day/night. Then I plan to take a train into Paris and spend the day there. Then I need to get into Bremen, Germany by train. I have zero idea how to do any of this. So all advice would be welcome. I am a 46 year old woman who is traveling with my father. I definitely know he doesn't have any idea how to travel like this. This is my first trip out of the country since I was 10. Help???