Chaos Magic Witch for 2.1, how do?

So for the Talisman League I want to run a build that uses the new Chaos spells. The only problem is I've never played a spellcaster before and I'm not familiar with how to build them.

Here's a rough draft I have for it:




Just a few things I want to point out about what I have so far:

- I'm not sure how much Mana and Life/ES I needed, so let me know if I should adjust it.
- I could invest a few more points into an extra curse, but I'm not sure if that's necessary. Plus having to manually apply 2 curses would be tedious. I'm also not sure which curse I should use. I'm guessing either Enfeeble, Temporal Chains, or Projectile Weakness would work best.
- And on a related question, how would I best go micro-managing 3 spells at once? Should I invest on alternative ways to apply spells?
- Which gems should I link to Essence Drain, Contagion, and Wither?
- Does anyone know if Essence Drain's heal works with Ghost Reaver, and if so, should I take it?

Any advice would be appreciated.