The early followers of Jesus were his Jewish apostles and disciples.  They formed a close-knit community.  As they ventured out of Jerusalem after the death and resurrection of Jesus, they formed other small groups of Christian communities.  During the first century of Christianity, we often refer to these Christians as the Primitive Christian Communities, not really a church yet, but described in the Acts of the Apostles.  As far as we know, these Jewish followers of Jesus prayed in the Temple and the synagogues.  They shared their stories about Jesus and his followers with other Jewish groups.  Out of this oral community will come the written documents of the New Testament.