For a single, small latte you will need about 6 ounces of milk. A good rule to follow is that you will need 6 ounces of milk per ounce of brewed espresso.
Grind the coffee
Using a coffee grinder, grind your coffee beens to very fine grind. The coffee grounds should be about the size of the grains of table salt.
Grind the espresso beans in a burr grinder for added freshness and control. Burr grinders will let you control how fine or coarse your espresso grounds turn out, and will result in a more consistent grind.