New to being a necro; few question.

[SNIPERS]

So I geared myself out in all HP gear and I enjoy soloing as a nec since it provides a different dimension than a Mage that I've been currently used to, but I have a few questions regarding how to efficiently exp.

1. What order am I supposed to attack a mob? Snare, dot, fear, dot? Then reapply snare/fear? Am I supposed to stack every single dot on a mob?
2. Is it worth giving a pet weapon(s) if I'm under level 20?
3. At what level should I begin to charm vs using a pet?
4. I have jboots, holgresh beads, cos. is there any other key items I need? I'll probably get a reclaim Mage weapon soon.
5. How does an iksar necro get spells, and barter with npcs?

Thanks!