This isn't a min/max build, but instead meant to help you look, act, and feel like a necromancer. Keep in mind too that I'm recommending things from the standpoint of roleplaying. This is, in my opinion, the best way to play a necromancer in Skyrim Special Edition without throwing in the crazy customization that mods bring. That's why I wanted to put together a short guide to help you out. For example, if you wear heavy armor, use a two-handed weapon, and raise the dead, you're more of a death knight than a necro.
but when you stray too much, you aren't really playing a necromancer anymore.