You basically have to figure out what your stall speed is with the configuration you want, like flaps. Keep it above that speed a little, then try not to tip it over trying to keep it flying straight while you turn to your strip.
I don't know what model of D-9 you tried, I just did the FW-190D-9, 1944
That thing sucks to fly at landing speeds.
No trim, and the controls are too touchy to not over control and crash.
When you are stable, lower the speed a little to start a decent infront of the landing strip.