Once the wine has cooked into the rice, add your first ladle of hot stock and a good pinch of salt. Turn down the heat to a highish simmer so the rice doesn't cook too quickly on the outside.
Keep adding ladles of stock, stirring and allowing each ladle of liquid to be absorbed before adding the next. This will take around 40 minutes. Taste the rice - is it cooked? Carry on adding stock until the rice is soft but with a slight bite. Don't forget to check the seasoning carefully.