Speak with Magus Tirth in the Shimmering Flats.
To make your wand, there are key passages in a certain book that I must read. The book is called Rituals of Power, written by the Magus Tirth.
I do not have a copy of his book, and none of the world's great libraries possess it. So you must speak with Tirth and gain it from him.
Good luck. Tirth used to be a great mage and scholar, but now he spends his time at the gnome and goblin races in the Shimmering Flats, drinking and gambling.