Forget post processing and get into pre processing. If not you'll end up with flat black and white photos.
Look out for natural contrast. Natural contrast is dark and light or complementary colors. Nothing else.
Crank up the contrast settings in post processing like crazy. "Contrast settings" is very a misleading term. "Destroying the mid range tones" hits the nail on the head. So use the contrast settings in a moderate way and you're fine. But where comes the contrast from if not from the contrast settings?
It's the same scene but this time I got my contrast when I was out in the fields/streets. I choose a wider scene with natural contrast and processed that for black and white.
Remember: Pre processing is the heavy duty job in photography. Post processing is for the refinements and nothing else.