They send a delegation to Galilee, but the delegation rejects Jesus’ teaching.In Alexandria, Philo (20 Jesus returns to Judea, is crucified, and resurrected. Jesus’ first followers receive the Holy Spirit at Pentecost and begin to proclaim the gospel (Acts 2).
The earliest New Testament books, the letters written by Paul, were composed in the decade of the 50s.
For just the order and dependencies of the gospels, I refer you to the synoptic problem on our sister site, Biblical Hermeneutics.
Since none of the documents are explicitly dated, the answer comes down to educated guesswork.
In the mid-60s, James, Peter, and Paul are all killed.
Peter and Paul likely perished during the persecution of the church in Rome by Nero.