The easy bit: in the first instance, write from what you know and draw on language that is familiar to you. The challenge: find a wise, knowledgeable, patient mentor with lots of time on his or her hands! And read widely and constantly and don't be afraid of initial parody when specific influences make themselves felt. Wait for your 'voice'.
Shooting in the Dark
The fifth novel in the Sam Turner series.
This is a thoroughly enjoyable, exciting and thoughtful novel. Mat Coward, Morning Star.