The best possible teacher for an aspiring necromancer is in fact the spirit of a deceased necromancer from times past. Finding or attracting such an entity seems like a monumental challenge for most, but there is a guaranteed method for those with an open mind and a few bills. Simply go on the internet and look for sites selling bound spirits. The people who summon and bind spirits are known as conjurers, and some are better than others.
I personally recommend the site Lilith’s Treasure Tavern. Go to the section on the site headed Contact Me, and fill out the form. Ask her for a price quote for a necromancer. If you have no experience with spirit-keeping I suggest mentioning that you would prefer a spirit that is relatively light in nature. Before doing this please go to the Creepy Hollows forum site and read through the sections titled Spirit Keeping and Beginner/Newbie Area to have a good idea of what you are getting yourself into. The practice of keeping bound spirits is vastly different from dealing with unbound spirits.
Thank you for reading, until next time!