In the book of Jude, that little epistle right before the Revelation, the writer stated that his desire was to encourage his readers to earnestly contend for the faith once delivered unto the saints. The Greek actually implies "once for all times delivered."
In other words, the Church of every age should have a vital connection to the disciples of whom we read in the book of Acts. A simple, vibrant, living and powerful faith in the resurrected Lord Jesus Christ!
Not a lot has been written about the structure of early Christian services, but what can be found reminds us that Jesus Christ was always at the center of all things. Worship, partaking of Communion, and renewing of total commitment were involved in their gatherings.
In my opinion we would do well to recapture the simplicity with which the early Church worshipped and served the Lord. Our times of corporate worship are not intended to be times of being entertained, nor are they times to necessarily make me "feel good". They are meant to be times of fervent worship and instruction in the ways of righteousness. Our services should also be times of powerful ministry as we seek the Lord according to His word and He responds with confirming signs and wonders.
Such services would launch us forth with a fresh infilling of the Spirit to, not only keep us, but also to empower us to impact our world for the holy cause of Christ!
May we truly contend for such a faith once again.
God bless