Originally Posted By: Daco
Is there any book that'll explain me structure in detailed way?Also that would explain me their business,like loansharking and stuffs like that?How people getting made,is there connection between boss and soldiers,or boss and associates?


There is plenty of information about that throughout this forum. Just do some searches.
The poster Turnbull has a great post on various mob myths and realities here.

The books "The Way of the Wiseguy" by former FBI agent Joe Pistone and "The Idiot's Guide to the Mafia" by mob expert Jerry Capeci have lots of useful information laid out in easy to comprehend language.

But basically those books just expand on what other posters have already written
Boss> Underboss>Counselor>Captain>Soldier>Associate

Money flows upwards to the boss and fear/discipline flows downward from him.
That's the general rule though like with anything else in life, there are exceptions.

"When the snows fall and the white winds blow, the lone wolf dies but the pack survives."
Winter is Coming

Now this is the Law of the Jungle—as old and as true as the sky; And the wolf that shall keep it may prosper, but the wolf that shall break it must die.
As the creeper that girdles the tree-trunk, the Law runneth forward and back; For the strength of the Pack is the Wolf, and the strength of the Wolf is the Pack.