Few friends of mine and I are getting together to do make some techno. They don't know any music, but one of them turntables.

I have two questions

what would be best for me to do since I'll be the only one who knows anything about music theory?

what is techno anyway? Is it just chords with melodies just like any song just with some fast beats?
I love wikipedia but that has got to be the most worthless piece of information i've ever read on there. It's a lot of words that say absolutely nothing.