Create Organisations, Users, Api Definitions, Key

I’m sorry but i don’t understand.

My workflow is as follows:
Create organization (use admin-auth header)
Create API Definition(using authorization header and having error because don’t know where can i read it from because i don’t have yet a user)
Create Key(using authorization header and having error because don’t know where can i read it from because i don’t have yet a user)
Create User(using authorization header and having error because don’t know where can i read it from because i don’t have yet a user)