Digital BW, The Print

I have access to an Epson 7880 printer at Sams Club. I'm expermenting 
at this time with black and white printing. I'm using Picture Window 
Pro and my basic work flow is using a color photo that is converted to 
monochrome and then converted back to RBG 24 bit file. I then load a 
curve that was provided by Mr. Roark's web site. Then I take the file 
to Sams Club for printing. Since I don't have much experience at this 
does anyone have advise for black and white printing at Sams Club?