What were the aims of the Japanese in the Kokoda campaign?

Why were Australian troops sent to defend the village of Kokoda? What were they called?
Describe the training, equipment and experience given to the Maroubra force.
How long did it take these troops to reach Kokoda from Port Moresby?
Why was the Battle of Isurava a major turning point in the campaign?
Why did the Japanese stop advancing along the Kokoda trail?
When was Kokoda taken back by the Allies?
What were the Maroubra Force known as after the Kokoda campaign?