Elminster: The Making of a Mage (Forgotten Realms: Elminster, #1)

From the back cover: It is the time before Myth Drannor, when the Heartlands are home to barbarians, and wicked dragons rule the skies. In these ancient days, Elminster is but a shepherd boy, dreaming of adventure and heroics. When a dragon-riding magelord sweeps down upon him, though, the boy is thrust into a world of harsh realities, corrupt rulers and evil sorcerers.