Death doesn't have to be the end of it all, especially not in a fantasy setting. While the basic rules cover certain necromantic spells, there's not a whole ton of it going around in detail in 5th Edition. That's where Whispers of Persephone come in. It's a new Necromancy Sourcebook that's up on Kickstarter now. (This post typed while Love You To Death plays on Pandora. Seemed fitting).
From the campaign:
This campaign funds the art and backer reward fulfillment costs of Whispers of Persephone,a necromantic source book for use in your role playing game. This book is written for specialist necromancer wizards, and describes a new arcane tradition, Stygian Necromancy. Created as a book of 120+ pages, containing entirely original art in full color by Christian Martinez and all original game content by W.S. "Sam" Quinton. Whispers of Persephone is a wonderful role-playing aid.
The campaign's about 2/3 of the way to its goal with 36 days left to go.