THE JEWISH BACKGROUND
Jewish worship centered on the Temple and synagogue (the latter having the greater influence on the development of Christian Worship). An emphasis in 'The Torah' become foremost as sacrifice declined. Elements of temple service and worship came into the synagogue. Synagogue prayers and practices became part of early Christian worship. When separation came from the synagogue it was natural that they still followed the synagogue model. Added to the reading of the Torah came new material, the Gospels and letters that became the New Testament. Prayers also became distinctively Christian in emphasis. Hymns (such as that in Phillipians 2) became placed alongside Psalms.

NEW CHRISTIAN ELEMENTS
The development of the 'Eucharist' following the 'Agape Feast', (alongside the breaking of bread in each others home) became the roots of the sacrament of communion.

Some specific Scriptures reflecting practices of worship
Acts 2:42 They devoted themselves to the apostles' teaching and to the fellowship, to the breaking of bread and to prayer.
Acts 2:46 Every day they continued to meet together in the temple courts. They broke bread in their homes and ate together with glad and sincere hearts,
Acts 20:7-11 On the first day of the week we came together to break bread. Paul spoke to the people and, because he intended to leave the next day, kept on talking until midnight. ⁸ There were many lamps in the upstairs room where we were meeting. ⁹ Seated in a window was a young man named Eutychus, who was sinking into a deep sleep as Paul talked on and on. When he was sound asleep, he fell to the ground from the third story and was picked up dead. ¹⁰ Paul went down, threw himself on the young man and put his arms around him. "Don't be alarmed," he said. "He's alive!" ¹¹ Then he went upstairs again and broke bread and ate. After talking until daylight, he left.
1 Corinthians 10:15 I speak as to wise men; judge for yourselves what I say. ¹⁶ The cup of blessing which we bless, is it not the communion of the blood of Christ? The bread which we break, is it not the communion of the body of Christ? ¹⁷ For we, though many, are one bread and one body; for we all partake of that one bread.
See also : 1 Corinthians 11:17-29 Problems at the table and 'The Words of Institution'.

As passages like the following one from Jude reveal all was not sweetness and light!
Jude 1:12 These men are blemishes at your love feasts, eating with you without the slightest qualm-- shepherds who feed only themselves. They are clouds without rain, blown along by the wind; autumn trees, without fruit and uprooted-- twice dead.

One of the church Fathers, Ignatius and an early church manual the 'Didache' refer to problem of having unbaptized participants present. At first the 'love feast' and 'eucharist' were separate celebrations, the latter following the former. Eventually the focus came to be on the sacrament of the eucharist.

2nd and 3rd CENTURY DEVELOPMENTS
Clements letter to the Corinthians (c.96AD) contains a long eucharistic prayer in which the 'Sanctus' appears.
Plinys letter to Trajan (c.112AD) talks of strange worship of a group of people in Bithynia that included meeting at daybreak, a 'sacramentum' - an act of loyalty and gathering later to eat.
The Didache speaks of Sunday as the day of celebration and offers blessings for the Brad and Wine (Chapter 9) .As well as detailing how to deal with problems that may arise with prophets (charismatas) who fell into a trance and started to ask for money!
Justin Martyrs Apologia (c.140AD) describes a Sunday Service and a Celebration of the Lords Supper.(Chapters LXV & LXVI)

      THE LITURGY OF THE WORD
      Readings
      Instruction
      Prayers
      Psalms and Hymns
      THE LITURGY OF THE UPPER ROOM
      The Kiss of Peace
      Offertory : Collection for the Poor.
      Bringing in the Elements
      Eucharistic Prayer
      (Thanksgiving, Memorial and the Invocation of the Spirit)
      Breaking of Bread
      Sharing of Bread and Wine
      Dismissal

3rd and 4th CENTURY DEVELOPMENTS
The Apostolic Tradition of Hippolytus (c.215AD)
Hippolytus gives detailed instructions regarding the conduct of worship, ordination and prayers for Christian Worship.

The post-apostolic church developed a pattern of worship that consisted first of a Liturgy of the Word which included Scripture, sermon and prayer, followed by a celebration of the Lords Supper.

Worship began to take on regional variations
Liturgy became stylized.

SIGNIFICANT POINTS!
A) The balance between Word and Sacrament
B) Exhortation as an element of worship
(Note: Catachumens would leave before the liturgy of the Upper Room)
C) Balance of Freedom and Order
D) Sequence of Prayer

POST-CONSTANTINE
After persecution ceased rapid development took place
      Worship became more formal
       Ritual became more elaborate
      A Greater Emphasis on the "Upper-Room"
      Liturgy developed - Spontaneity declined.