Jesus Bringer of Immortality

Paul writes to Timothy concerning our Lord Jesus. God, who has saved us and called us with a holy calling, not according to our works, but according to His own purpose and grace which was granted us in Christ Jesus from all eternity, 10 but now has been revealed by the appearing of our Savior Christ Jesus, who abolished death and brought life and immortality to light through the gospel . 2 Timothy 1:9-10
Jesus in his incarnation abolished death and brought life and immortality. To explore the meaning of this work of Christ Jesus we need to ask and answer two questions. Where or in whom is eternal life? When does eternal life begin. Second Jesus is referred to as the firstfruits from the dead and the firstborn of and from the dead.
Revelation 1:5 and from Jesus Christ the faithful witness, the firstborn of the dead, and the ruler of kings on earth. To him who loves us and has freed us from our sins by his blood

Colossians 1:18
And he is the head of the body, the church. He is the beginning, the firstborn from the dead, that in everything he might be preeminent.

What does this mean and what bearing does it have on us and the resurrection from the dead?