To understand the ceremonious inauguration of Jesus to his new job let us look at Genesis 41, 37ss. There Joseph was appointed to his new office by the Pharaoh. He got a signet-ring, a chain of office, the right to wear official dress and to take a chariot.
I suppose Jesus too would have got these insignia of power. Instead of the chariot Jesus took a sedan like the noble Romans. When he went to another city, a herald (Greek: keryx, kerux) announced his coming. The Greek word for the Christian message of Jesus retains the memory of the herald who announced the governor Jesus: the word is kerygma, the message of a herald.