How do I research spells
 

I don't have any idea how to research spells. Where do I start? Ultimately I know there are spells that are research only. Any help would be greatly appreciated. I'm a level 16 necromancer. Someone told me to get a book of dark bindings, that's all I know. I don't know what to do with it once I get it. I'm assuming it can be bought from a vendor.