In Acts 2, the Holy Spirit does indeed come. The church is birthed and its mission is established. That mission, under the anointing of the Holy Spirit, is to carry out His command to take the gospel to the world, from Jerusalem to Judea to Samaria and to the ends of the earth. Beginning first with God's transforming power in our lives, each of us must play our respective role in the Kingdom so that the Church functions synergistically and fulfills the task of reaching the world for Christ. Further, the function itself is more important than the form that we use to accomplish the function.
Managers are concerned with efficiency.
For instance, they are interested in making their machine operate in an optimal fashion. Leaders, on the other hand, are more concerned with effectiveness. In the early Church, the primary activities were key ministry functions such as prayer, fellowship, evangelism, etc. These functions are integral to the Church no matter what the culture or time period. The pattern of the early church was a pattern of function.