Um, just practice?
It should come with practice. Maybe do the irish hiking scarf, can be found for free... if I remember correctly.
Or just try your own thing.
Normally it goes like this
For one cable of width y/2: (surrounded by a border of x stitches)
Row 1: Knit x, purl y, knit x
Row 2: purl x, knit y, purl x
(repeat those rows a few times, ending with row 1)
Cable row (a row 2): purl x, slide y/2 to cable needle, hold in front or back, depending on what side you want to cable to turn, knit y/2, knit the stitches from cable needle, purl x
Repeat that as many times as desired for a cabled something....
The ways of Yarn are inscrutable.
I'm NOT a "miss", I'm a lady!