1) Install from a cd and a net install. How to write a sources.list. Where to get the cd images.
2) very simple language, since only beginners will use it. Dont go into detail on hacks etc.
3) I've never really seen many good guides with screen shots and descriptions, only one or the other. Maybe you could make it work
4) what sort of drivers? I'd include ATI and Nvidia for sure, since they both work first time around and within 2mins (unlike a few years ago)
5) I think a good idea maybe be to have one page for the text instructions, and make another with screenshots and shorter descriptions.
I'm also thinking of doing this, since I've slowly built up a library of handwritten notes on all sorts of stuff. Configuring apache, useful apps etc.
Good luck with your work.