An interesting book that was in my local library and gave me some nice approaches-
http://www.barnesandnoble.com/w/black-white-pipeline-ted-dillard/1112224013?ean=9781600594007
He has a chapter or two devoted to some software converters, like Nik SilverFX or whatever it is called. And he has a good system for creating multiple RAW conversions and blending them together using smart layers- very powerful when you add the color shifting options of B&W conversions.
My preferred method to learn a new technique is to find a method that seems to make sense and LEARN IT. Use it until it breaks. Jumping from software to software, filter to filter, hardware to software to filter doesn't teach me much. It keeps me busy, but I find I am spinning tech wheels, not making images.
Like with a film-pick one, one developer, and push it for a while. Learn it. If it still comes up short, start adding new techniques. Or throw it out and pick up another one.Until I have worked with a structured approach, though, I don't even understand what is working and what isn't, so finding a new system is a guess.
One thing to remember with doing color conversions- the color you start with doesn't matter. If desaturating the red channel and turning the blue channel magenta makes it convert to the look you want, that's the way to do it. If you want red roses to convert to light gray, brighten the red until it hurts.
Then again, I know people who bought SilverFX and that's all they needed.
And find models. Printers to emulate. Print out some of their work from the web or have books handy so you remember what you want in your prints. Sounds like some of W. Eugene Smith's work should be on your wall-
http://www.bing.com/images/search?q...ata&qpvt=w.+eugene+smith+minamata&FORM=IGRE#a
http://www.bing.com/images/search?q=w.+eugene+smith+magnum&FORM=HDRSC2