Sorcerer

Though there is no hard and fast rule as to how a wizard or sorceror should continue their studies, there is a general trend for both. Sorcerers tend to experiment more in the dark arts and eventually become (more often than not) Demonomancers. This is not the best choice if you're looking to keep your sanity, but the fact cannot be denied that demons do get the job done (sometimes even the way you ask them to). Try to avoid letting the raw power of evil magics take over your mind. This is far easier said than done, but the key is this: Sorcerers, though generally nice, are occasionally self-serving and nasty. Power, for a Sorceror, is typically attained by convincing people to do their work for them. A classic example of this is a soul stealer. They are a very special breed of Sorcerer that drain a portion of the life force of their victims in exchange for party-trick style magical favours. They receive a lot more than they give. This power of the soul is then either consumed and turned into raw magical power or is re-released to do the Sorcerer's bidding. A Sorcerer has a very hard job ahead if they intend to remain a Sorcerer. Many (and truly most) Sorcerers become Conjurers and Demonomancers or kill themselves. Be ever vigilant not to let evil totally overtake your mind. To continue Sorcerer studies, become very proficient at the elemental spells (fire, wind, water, earth).
When you can control the elements, then try to control demons. When controlling demons, start small and gradually work your way up!!! Never ever ever ever ever try to start at the top or you'll be possessed and you'll end up killing yourself against your will. Remember that, unlike Conjurers, Sorcerers have no protection against the dangers of demons.