Yamaha DTXpress/DTXplorer/DTXtreme

OK,

I haven't posted in a while, I have a question. What exactly do I need to 
get the DTXpress working with my computer?  Now I work in Computers, and 
video editing, but when it comes to this I'm as dumb as a box of rocks! so 
could some one please explain what I need to get, to get these two marvels 
of technology on talking terms?  What type of software?  I have a midiman 
USB interface box.  I mean really give it to me in laymen terms, what plugs 
into what, the whole bit.  that would be great.  OH  I'm also using a copy 
of Sonic Foundry's ACID Music 2.0 on my computer ,  is that MIDI 
compatible?  or do I need to get like Protools or Cakewalk or something 
like that.  My new computer is on the way today Dell 4100 with Pentium 3, 
850 MHz. 128 megs of RAM really screaming system.  I have a great key board 
from Roland with midi Jacks, and my plan is to hook up the whole shootin' 
match DTXPRESS, Keyboard, New Dell, and have a cool little studio.  Someone 
help!!!!  Thanks guys!

Herb