Hi Lancer - in answer to your question's.
1. - just be honest with them,tell them it's something you've allway's wanted to do and you enjoy travelling etc....
2. - Airline manager's allway's like people who are "TEAM" player's so give them some example's of when you have worked as part of a team. They also like people who are customer focused as at the end of the day it's the passenger that pay's your wage's so it's in your's and the airline's interest to keep the self loading freight happy. Airline manager's also like people who one day could be capable of being a manager as at the end of the day that is what you will become a manager of people be it on the flt deck as the captain or as a general manager - so give them some example's of leadership or when you have taken control of a situation.
I hope this is of some help to you..
Best Regards and Best of Luck....
W.G