Here is a visual rundown of what happens in the Parsha
The final 3 plagues come after Pharaoh’s fate was already sealed. God is keeping Pharaoh around to maximize the spectacle of the plagues. Finally the death of all firstborn in Egypt is the straw that breaks Pharaoh’s back and he agrees to let the Jews leave.
On the night of their exodus, God commands the Jews to eat a special meal to signify their newfound status, called the korban pesach, or Pesach Offering. The korban had many rules associated with it. Some of these rules were to inculcate the former slaves with a sense of royalty. Some rules were meant so they never forget their humble roots. Still others were designed to foster the Jews newfound faith in God.