In each place where there are Christians, they meet together as a group and form the church of Christ in that place. Each of these groups is independent. Each has its own leaders. Each church of Christ is overseen by elders and served by deacons when it is fully organized. Elders are called by different names in the New Testament.
Deacons are leaders who serve under the elders.
Not everyone can be an elder or a deacon. One must be a good man before he can do this work. No one can serve as an elder or deacon unless he meets God's qualifications. No church can have elders or deacons until they have men who meet these qualifications. The Bible tells is that Christ's church meets on Sunday, the first day of the week, for the worship of God.