In the past, when I use to shot BW film, my way to achieve better photos usually rely on contrast. Contrast in BW is achieved by adding color filters (Green, Red, Yellow, Orange, etc.) If you shoot the a sky with clouds just like the Sistine Chapel in BW without a filter, you will be later disappointed that in BW white and light blue are the same, so add a filter and thus, you will have contrast.
What does this has to do with this thread??? Well, Follow Carrigman advise... shoot in color. Then, convert it to BW in a software which is able to control each channel of color while outputting monochrome. In Photoshop you go this way:
In the menus:
Layer,
New Adjustment Layer,
Channel Mixer,
OK,
then in the Dialog Box, check the Monochrome on the bottom left.
Now play with the three channels of color (R,G,B) independently until you are satisfied with the result. Tip, if you correctly exposed the photo the sum of the three channels should be maintained at 100%, and maybe this is the time to correct the exposure….
Regards,
Carlos