A course of justice begins when a court/judicial body is *invoked*. In criminal proceedings, this would be the laying of a charge or the arrest of an accused (where you tell them the nature of the charge).
(_R v Rogerson_ (1992) 174 CLR 268 at 276 and 303 per Mason CJ, 283 per Brennan and Toohey JJ and 303 per McHugh J)