Let's take a quick look at Drupal's jargon regarding teams.
Users —the logins of the individuals that make up a team.
Roles —the different 'job descriptions' based on a person's responsibilities
Permissions—the granting of authorization to perform a Drupal function
As the system administrator, you are authorized to perform any action within the Drupal environment, but you would not want every member of a team to have this absolute capability, or else you would soon have chaos.
Let's first create a team. Then, we will look at assimilating that team into the Drupal environment.
Our Creative team will be made up of individuals, each having one or more of the responsibilities mentioned below (Note: the titles are not Drupal terms):