...it's very important, and I imagine that everyone has to find their own way of doing it. which makes offering advice on this vital topic so extremely difficult. in an earlier time...we'd be participating in some religious ceremony, something hushed and secret and sad, that taught us how to handle Death better; instead we're smothered with flowers and false promises about eternity (of one sort or another).
I will tell you what two books helped me the most. I read the first when I was a child—I'd been through so much abuse at that point, reading stuff like Kafka or Tolstoy didn't faze me, at least on the surface. the book is The Death of Ivan Ilyich and it's written from a Christian perspective, although it's not a Christian devotional work or anything of that sort.
the second book might be better for a first read; it gave me, in its quiet way, a reason to live in the face of certain misery and death. it's Albert Camus's The Plague.
I ought to reread both. it's the season for it
~Chara of Pnictogen