Hold the cue loosely in your back hand, like you're holding a small bird: your thumb and first two fingers do the work, the other fingers just rest on the cue.
When the tip meets the cue ball, your back forearm should hang straight down, perpendicular to the floor.
Line your back foot (the right foot if you're right-handed) up with the shot line, step forward and slightly out with your front foot, and keep your weight evenly balanced.
Keep your chin 5–15 cm above the cue, with your eyes right over the shot line.