OpenEyes, I've had the same problem.. Almost exact same problem.. Only thing is, I started telling them (hard-core Catholics, none the less) that I was seeing demons. I'd get used to certain spirits being around.. But there were other, darker ones (as you described the little girl). I started to associate them with the archetypal demon, and then I got stuck in counselling for about a year..
But, I guess i had good luck. ^_^ One of the counselors is also pagan, and understood exactly where I was coming from.
I guess the point is, don't give up, do your research, and keep yourself safe.
(PS: I was talking about Necromancy as in the "Talking to the shades of the dead" aspect, and though I personally find raising corpses morally wrong, I know it requires a lot of energy.. And that energy has to come from somewhere, hopefully not you, 'cause to bring back the dead, you need to provide enough energy to sustain and restart life.. Basic physics: Any action has an equal and opposite reaction. If you have the action (death), than the equal and opposite would be life, meaning it might cost you your life.
And I personally don't think that the Earth would provide the energy for that.. It just got their energy and turned it back out to a new life. There's only a few options as I see it: The Universe (BIG store of energy, if you can access it.) Demons (Could have negative repercussions) Divine Intervention (If it happens, than maybe the person wasn't supposed to be dead after all...)
Anyway, I don't mean to discourage.. Just be careful and study before doing anything serious.