Yamaha DTXpress/DTXplorer/DTXtreme

Hi i have a dtxpress III and pc with cubase sx 3 and cool edit

I am a beginner to this so really need help getting midi setup

I have bought midi cables and plugged them in to my audiophile 2496 
soundcard and to the dtx.

i really dont know what to do to set up the instrument so that when 
you hit the drum it records it in the midi track.

its very confusing with selecting channels inputs

basically i need a guide to help me setup my midi kit so please help 
me someone