How does darius conceptualize his empire and what are the expectations and obligations that he places on his subjects ?

Darius I (also called Darius the Great) saw his empire as a circle of territories all under his influence and rule. As he extended his conquests, he organized the Persian Empire into 20 satrapies (provinces), each of which could govern their own affairs to an extent, as long as they paid their proper tribute to the emperor.  He saw himself (and wanted to be seen) as the rightful ruler of all the lands from the Mediterranean to the Indus River. Subjects were obligated (in addition to paying tribute owed) to revere him with proper respect and obey any laws or decrees that he issued.

its main object was the establishment of "settlement houses" in poor urban areas, in which volunteer middle-class "settlement workers" would live, hoping to share knowledge and culture with, and alleviate the poverty of, their low-income neighbors.