There is a lot of confusion today about what the central mission of the church is. Here are a couple of very helpful books on the subject.
1. The Gospel Commission, by Michael Horton
2. What is the Mission of the Church?, by Kevin DeYoung & Greg Gilbert
If you want clarity about what Jesus wants (commands!) the church to do, I highly recommend these two books to you.
Both of them ground our mission in the Great Commission (Matthew 28:18-20).