What is the main structure of any professional management ?

Management has fundamentally three layers.

Junior management involves supervising the people who actually do the work.  Allocating tasks, checking everything is done correctly, organising rotas, that sort of thing.  Sometimes they do some of the work themselves.

Middle management manage the junior managers.  They do administration and take low level decisions. 

Senior managers take the important decisions that affect the whole business. 

In a small business one person may do more than one of these roles.  In a large business there may be additional sub-layers within the Middle and Senior layers.