Don't just go out and buy tons of filters first, buy only what you need. RemAcuTetigisti has given you good advice, but you don't need all of the filters. A good starter filter is yellow. Get that first, shoot a few rolls, and try to articulate any things you like to change, e.g want darker skies (need red), want more contrast in skin tones (need blue), want more contrast in foliage(need green). For each thing you want to change, only get that filter particular filter then. And remember that for true B&W, taking the picture is only half the process. Developing and printing in the darkroom is the other half and is just as important, if not more so. Of course with photoshop, dodging and burning can now be done digitally, but a good B&W print is dependent on the whole process. So don't blame yourself immediately if the prints are not what you want, it's just as likely your developer is at fault (if you don't process and print yourself). Most B&W developing I've seen in shops is like sh*t, prints coming out murky grey. It took me a while to find a developer I like and trust here in London...