Yamaha DTXpress/DTXplorer/DTXtreme

I just got a dtxpress II kit, I have to cables to run to and from my 
pc, now, what program do I need to record stuff and play midi and 
whatnot to my drums, can I use the one at best buy called "digital 
music" its like a 40 dollar program. Or, do I even need a program. 
please give a short simple outline of what I need to do, that manual 
is too intimidating at the moment. Thanks,
Rob