On Death and Dying

This week I have had 3 people I know die. I went to one's funeral but the other two were many miles away and 2 were having funerals today at the same time! All this on my birthday. It causes me to remember Psalm 90 verses 3, 9-12 "You return man to dust and say, "Return, O children of man!" ... For all our days pass away under your wrath; we bring our years to an end like a sigh. The years of our life are seventy, or even by reason of strength eighty; yet their span is but toil and trouble; they are soon gone, and we fly away. Who considers the power of your anger, and your wrath according to the fear of you? So teach us to number our days that we may get a heart of wisdom. What does the Bible teach us about the reality of death? The location of the spirits of the dead? And how does Jesus Christ birth, death and resurrection address this issue?