It was the practice of every Church in the New Testament to have a plurality of Elders ( bishops) in place to govern the affairs and serve as the spiritual leaders of that Church. The Apostle Paul gives instructions concerning these men in 1 Tim. 3:1-7 and in Titus 1:5-11.
It appears in the New Testament that the first Christians observed the Lord's Supper each Lord's Day (Sunday or the first day of the week). Acts 20:7, "Now on the first day of the week, when the disciples came together to break bread, Paul ready to depart the next day, spoke to them and continued his message until midnight."