Digital BW, The Print

I am new to this board and have been monitoring (with great 
interest) the continuing exhange of opinion and fact regarding 
digital BW output. It is of particular interest since I have had a 
number of requests for my images in BW. Generally, I shoot with a 
Nikon D100, (NEF Raw), correct color to my liking and convert to bw 
by either selecting the most favorable RGB channel or more often go 
from the lightness channel in LAB color and then saving to 
grayscale. I am achieving satisfactory results on the screen, but 
the RGB output, for the most part does have a color cast of some 
sort. My editing software is PS/CS. My printer is an EPSON 2200.
I went to the MIS site to see about the much-heralded Eboni, but in 
my on inimitable manner failed to click the correct link. For those 
of you who have graciously stuck with me to this point, my questions 
are:
1. Is BO output from the black cartridge only ... or do you put 
black cartridges in all the slots?

2. What is the simplest way to start the experimental output 
(shortest learning curve) ... and then graduate to curves, 
workflows, etc.?

Thanks for your patience from down here in LA (Lower Arkansas).

Kindest regards,
Joe