Where do you put human contacts on the Organization entry?
Both organizations and individuals are 'contact' entities in CiviCRM (a household is also a 'contact'). An organization is a separate 'contact' from the individuals related to that organization.  By having the organization entity separate from the people in/related to that organization, you can specify the nature of the relationships those people have to the org.

You'll want to create an organization (Top menu > Contacts > New Organization, as you have done) then separately create individuals (Top menu > Contacts > New Individual) who have relationships to that organization. You can connect the individual(s) to the org with either the Current Employer field or using the relationships tab on a contact's summary screen once a contact has been created.

You can read more about contacts and relationships here: http://docs.civicrm.org/user/en/4.6/organising-your-data/contacts/