The apostles must now spread the good news. They have to spread what Jesus said so Jesus can come into their hearts. The apostles must've been excited and a bit nervous about telling people about Jesus.
What would you have done if you were and apostle? Would you tell people what happened with Jesus? Would you travel all over to tell people? Would you write letters to people? What would you tell them? What would you do to show God's mercy? What can you do now to show people what Jesus did for you and them?
Jesus gave his apostles a big task. What would've happened if they said no? Would you've said no? Would you've said yes?
Jesus trusted the apostles to spread the good news and to start forgiving sins, and also begin the church and help it grow. Would you have been happy if you got to do that?