Numbers 28, 29, & 30

What is the purpose of the daily offerings? Why did animals need to die in order for the sacrifices to be done correctly? Were the priests to work on the Sabbath? How was the Passover to be observed? What was the point of the festivals and holidays that the Israelites were told by God to follow and enjoy? Why is making a vow okay? Is there a wrong way to do it? How does God differentiate vows between male and female Israelites?