In this passage, the most important thing to notice about mission is that it is the work of Christ through His Holy Spirit (John20:22). In v2 it is the Holy Spirit who calls Barnabas and Saul. Of course, the Church is involved, they laid their hands on the men, meaning, the Church ordained them. Ordination is a serious business. The men were well known by the Church, but even though the Holy Spirit called the men, and before the ordination took place, the Church fasted and prayed.
We should never see ordination as an ordinary thing. For yourself, please do not ever decide that you are going to be a pastor and then appoint yourself.
Having a desire to serve in this way is good, but the call is from the Holy Spirit through His people. And even if you are not called to be an evangelist, a pastor, a teacher, etc., what you do in the Church is still the calling of God!
Meditate on verse 2-3. Who has appointed you to do what you do?
My heavenly Father, I pray that the Holy Spirit will always direct my ways.
In the name of Jesus Christ I pray. Amen.