Jack begins by telling them, "We'll hunt. I'm going to be chief," in this way immediately distinguishing his style of leadership from that of Ralph, and "the crisis passed easily" by him taking command in this way. He then tells them they won't dream in this portion of the island, and after that he tells them they will hunt pig and give some of the kill to the beast. When they raid Ralph's camp for the fire, he tells his tribe "Go on--now!" and then repeats that order. Two boys raise their spears and respond,"The Chief has spoken," implying that Jack has ordered them to behave in this way to give recognition to his leadership.
Jack tells his new tribe that they will invite the others to feast upon their meat at their new camp on the beach. He also tells them that they will steal the fire they need to keep their camp alive and that they will offer the pig's head to "the beast" as a thank you for their successful hunt. He is leading his tribe very differently than Ralph- he has instantly become a dictator and the others, for now, are following his lead because he has provided them with a means for procuring meat.
Jack gives the boys the idea to give a sacrifice to the "beast" so they may be safe from harm. This gives him an advantage over Ralph because unlike Ralph, Jack is giving the boys a reason not to fear the beast. In some way, Jack's tribe is worshipping the beast, that is, their savage instinct. This allows for their killing lust to grow, resulting in a downfall of humanity and order.
What does Jack tell his new tribe?