hi tomaxz
what yuo're searching for is called 'bleeds' ('file' → 'document setup' → 'document' → 'bleeds')
when you generate your .pdf file, make sure that the box: 'use document bleeds' ('save as pdf' → 'pre-press' → 'bleed settings') is checked or insert the desired bleed area here.
ask your print shop, if they need any crop, bleed or registration marks, before you set them…
utnik