You will want a dragon mount for a hero. I like their magic but the 5+ roll for anything makes you want two sorccerors and i would go with less chariots due to terrain limits. I would also double down with the spawns to make them a force on the battlefield. I like moving them into position with my infantry and then leaving them there for their initiative and missiles, but my formation puts them in the front with 3+ armor from missiles. Good start !