I forgot to include these other sentences. As they are instructions, I'm not sure whether it is possible to use "you have to.., you'll have to". Thank you.

Question

I forgot to include these other sentences. As they are instructions, I'm not sure whether it is possible to use "you have to.., you'll have to". Thank you.

1) Go through passport control.There an official checks (will check?) your passport.All things (or everything is) are put on a counter.
2) Go into the departure lounge. There you can spend time buying things in the duty free.
3) Go to your gate number and wait for your flight to be announced. Now you can board it (??).Have a nice flight and enjoy the journey.
4) Make sure your luggage isn't more than 20 Kilos (better: doesn't exceed 20 kilos) because you have to pay (you'll have to pay, you are expected to pay) for excess luggage.
5) You have to put all your baggage on a conveyor belt where they can be scanned for metal or other dangerous objects.
6) If you have a piece of hand luggage, you'll put it under your seat or in the locker above your seat.
You can buy things in the duty-free, such as (or e.g.) perfume or souvenirs.
Do you know the meaning of "e.g"?

Answer 1

a space after every period and comma

3. it = ??

all alternatives are OK

e.g. = "for example"
http://www.answers.com/topic/e-g

Answer 2

Yes, I can explain the meaning of "e.g.". "e.g." is an abbreviation for the Latin phrase "exempli gratia," which translates to "for example" in English. It is used to introduce one or more examples that illustrate or clarify a previous statement. In the context you mentioned, "e.g." is used to suggest that perfume and souvenirs are just a few examples of the various items available for purchase in the duty-free area.