Nearly all of the church's functions can be seen as the work of communication. Evangelism is the effective communication of the gospel to unbelievers. Fellowship is the effective communication of love to one another. Teaching is the effective communication of God's ways to believers. Worship is the effective communication of praise to God.
Effective communication makes the gospel clear.
Effective communication makes instructions clear. A written message lives until destroyed. First, determine what they need to hear. Come again next week. I do not give to you as the world gives.