Try setting your Mode dial to "S" for Shutter Priority. You can choose to view your choices through the eyepiece or on the monitor, as you turn the Command Dial in upper-right backside. You can synchronize flash with daylight exposure at 1/200, or slower. All other settings will remain automatic. At ISO 200, a normal exposure should be 1/200 at f/16. Now manipulate your flash output to 1/2 of full exposure to achieve 2:1 lighting ratio, or 1/3rd to achieve 3:1 ratio.
An automatic TTL flash (such as an SB-600) allows choices of fill lighting ratio.