Can you please check if these sentences are possible, please?

Question

Thank you.

1)You can book your train journey online or through a travel agency.
First you make sure your passport is not out of the date.
3) Check the train time (time table?) and the fare.
4)Then buy your ticket and go on the platform. Punch your ticket before getting into the train.
5)If you have reserved a seat, make sure you get in the right carriage of the train. You can ask for a single or a return ticket.
6) You can book a two-berth compartment or a seat in first or economy class (Can you tell me the type of train tickets you can buy in America?)
7) Would you rather I went there by bus or on foot? Would you rather I made an appointment with the doctor today or tomorrow?
8) Is it all right if I close the door? Would it be all right if I closed the door? How can I reply? "Yes, of course/sure/certainly... Go ahead/OK
9) Could I close the door? Yes, certainly ("Yes, you can. Is it possible?)Do you mind if I close the door? No, not at all (is this the only possible answer?)When the doors are open you disembark (the plane???) and walk through the terminal building.

Answer 1

1) You can book your train journey online or through a travel agency.
First make sure your passport is not out of the date.

3) Check the train schedule and the fare.

4) Then buy your ticket and go on the platform. Punch your ticket before getting onto the train.
(Usually, the ticket is punched by a conductor AFTER you are seated and sometimes after the train starts to move.)

5) If you have reserved a seat, make sure you get in the right carriage of the train. You can ask for a one-way or a return ticket.

6) You can book a two-berth compartment or a seat in first or economy class (Can you tell me the type of train tickets you can buy in America?)
http://studenttravel.about.com/od/usstudenttraintravel/ig/Amtrak-Train-Photos-Gallery/Amtrak-Train-Tickets.htm
Scroll down to the list of links. There are coach, superliner, sleeper, family sleeper, and others.

7) OK

8) Is it all right if I close the door? Would it be all right if I closed the door? How can I reply? "Yes, of course/sure/certainly... Go ahead/OK
(All those responses are fine.)

9) Could I close the door? Yes, certainly (Yes, you can. Is it possible? YES) Do you mind if I close the door? No, not at all (is this the only possible answer? IT'S THE ONLY ONE THAT MAKES SENSE WITH THE NEGATIVE IN THE QUESTION.) When the doors are open, you can exit the plane and walk through the terminal.