Personally I don't have a set way to process/convert digital images to B&W and as a lot depends on what type of image I'm working on as things that may make a for nice B&W landscape can make for a poor B&W portrait.
For the type of landscape shot shown below I'll generally follow the process listed below in LR 5
1. Set Highlight and white slider as far to the right without clipping highlights or pull them down to the left if I did clip the highlights
2. Covert image to B&W
3. Set WB to Daylight (will also try other WB presets to see if one looks better
4. Set the shadow slider to +100 and Black slider to -70 to -100 Than adjust each as needed.
5. Adjust exposure/contrast and clarity as needed
** On pretty much every landscape B&W I utilize and graduated filter on the sky portion of the image
usually setting are
Exposure depends on the image but usually somewhere between -.5 and -1.25