Hello everyone, does anyone know any good starting points for learning Necromancy?

I've been researching the topic for a while and I would really like to gain some first hand knowledge. My problem is that the more I read, the more daunting the prospect becomes. Not only do I have to wade through countless pages of RPG nonsense, but when I do come across some genuine information, it seems everyone has their own interpretation of what necromancy actually is and what is involved in its practice. I understand that every practitioner is an individual and so is likely to have their own opinions of the art based on their own experiences but isn't there a 'common ground' if you will, some basic exercises to atleast get me started so I can begin to form my own ideas and enjoy the art for what it can offer?

Any help at all will be greatly appreciated.