Young explorers: a brief history of money

What the video, and try and answer these questions.

YOUNG EXPLORERS: A BRIEF HISTORY OF MONEY
1.    Who is James going to see?
2.    What is Irving Finkel showing James?
3.    How were workmen paid, according to the document from question 2?
4.    What goods have been used as currency, according to the documentary?
5.    What were people happy to use in exchange for other goods 2.500 years ago?
6.    When does the early coin which James is showing us date back to?
7.    What were these early coins made of?
8.    What did coins become useful for?
9.    Why did historical leaders have their faces put on coins?
10.    What does Catherine Eagleton use to make a coin?
11.    Why did people start using paper money?
12.    What is required for something to be used as money?