spoken like a true beginner... But that's okay - you're here to learn.
B+W is not simply the absence of color. Many of us raised on film, especially b+w film, know that color/tonal value of a scene can be enhanced or diminished with a filter. A yellow filter will darken skies just a bit and enhance foliage. A red filter smooths skin and adds considerable drama to a landscape. Read up on Ansel Adams - he understood the importance of "color" in b+w photography.
With digital, it isn't really that different. In fact, I am learning that digi b+w allows me more creativity in creating a final image. A few things to remember:
If you have a digi camera with a b+w mode - forget it even exists. Don't ever ever use it. B+W modes on digi cameras are hideous. Same goes for sepia modes. BLECH!
Don't simply convert to grayscale and tweak with brightness/contras. Why throw away all of that color information?
Here's my digi b+w technique.
Shoot in color.
Tweak your color balance, do your touch ups, clean up your image all in full color.
Create a hue/saturation layer.
Create a second hue/saturation layer.
In the top HS layer, turn the saturation all the way down to 0. That will give you a basic grayscale image.
In the bottom HS layer, change the mode to "color" then open the layer control. Pick a color. I ususally start with red. Slide that Hue control back and forth and see how it changes your image. Same with the saturation and level bars. Move them around until you find the image you like.
Play with the other colors, esp. yellow and green.
This is exactly like adding filters to the front of your lens if you're shooting b+w film.
Give it a try!