Each player randomly generates spells for each of their Wizards before armies are deployed. If your army contains more than one Wizard, you may generate spells for each in an order of your choosing.
Each Lore of Magic contains seven spells: six numbered (1-6) and a seventh 'signature' spell. To determine the spells your Wizard knows, roll a number of D6 equal to their Level of Wizardry, re-rolling any duplicate results. The result(s) show which spell(s) your Wizard knows.
If you wish, your Wizard may discard one of these randomly generated spells and instead select the signature spell of their chosen Lore of Magic. Any number of Wizards in your army may do this.
Note that Wizards in the same army may know the same spell(s), so individual spells may be duplicated within your army. However, no single Wizard can know the same spell twice.