What can he do as a magician with Magic 0?
Not much... :-(
He must expend 5 karma to gain Magic 1?
Yes (as do all magicians that happen to end up with a current magic rating of 0).
SWC p. 146 Latent Awakening
As with all magicians and technomancers, the newly Awakened/Emerged character may raise their Magic or Resonance attribute via Karma expenditure.After they awaken they probably also want to spend karma to buy the Sorcery skill (and Conjuring skill) and learn an actual spell or ritual or two.
