you need to buy a stereo condenser mic. i bought mine at a sony store for about $150 canadian. you can get better, smaller mics but they are more expensive and you might have to order them. when recording the show you should have the mic as high as possible, above the heads of the crowd if possible. i put mine on top of my head underneath my hoody usually. Or i put it on my shoulder if recording isn't allowed. the best place to stand in my opinion is right in the middle, equal distance from each speaker, halfway back in the crowd. to transfer the show to your computer you need a usb cord. you can download this program for free from sony to put it on your computer. its called sonicstage 4.3. it inputs the show into your computer and converts it to a wav file.:
http://musicstore.connect.com/custom.../download.html
if you have any more questions just message me!