Although the amount of milk and sugar varies from person to person, we all tend to follow the same method, one which is explained by Yorkshire Tea, with boiling the water and prepping your mug with a tea bag being the first steps.
When the water is hot enough, pour it into your mug and wait patiently for it to brew - four to five minutes. Gently squidge the tea bag against the side of the mug and add as much milk and sugar as you please.