The local church is the key to sending out missionaries:
The apostle Paul and Barnabas were commissioned and sent out by a local church. (Acts 13:1-4).
Before they were approved of and sent out, they were serving in the local church. (Acts 11:26)
Paul exhorted the church at Rome that they are also called to Christ, (Romans 1:5 – “you also are the called” – as Paul says, “we were called to be apostles”, 1:1-4) In Romans 10:13-15 and 15:20-21 and 16:25-27; these are all basically exhortations to the local church at Rome to share and own the vision and passion that the apostle Paul has.