Necromancy tips

Hey all! Is their any good videos out there explaining WHEN to use each of the necromancy abilities manually? I want to start learning manual inputs and would love to improve as I plan on taking on zuk next.

Also i saw a video a few days ago where the YouTuber demonstrated how Alt 1 has features for necromancy to show your residual spirit stacks and your necrosis stacks above/below your health bar and i think this would help me a ton. If anybody knows exactly how to get that, please do tell!