As long as you stay away from plagerism, you could peek at other newbie sites (I'd give some links here but I have the feeling it's better not to), see how are they structured and what they're focused on and that could give you an idea on how to profile your site.
What caps_phisto said is indeed really needed for n00bs. Just one ammendation regarding the install guides: each distro has its own type of installation (both the OS itself and other software as well), so that would result in not just one guide, but several, one for each (major) distro.
So you could categorize the guides on several levels:
-a short (or long
) intro to Linux,
-a few basic commands which will be needed for the next level which could be
-installing the OS, configuring the network connection, setting up the video and sound card
-filesystems in Linux
-usual commands for day-to-day use
-configuring other peripherals
-installing new programs (see the remarks above)
-Linux administration (a bit more advanced commands), including users/groups adding/removing, password changing, permissions, etc.
and last (there are many more but that's what came to my mind right now), but not least
-security: again, like caps_phisto said, using only services you really need, backups, firewalling, periodic checks of the integrity of the system, etc.
Of course, that should be all written in a simple yet useful manner, understandable by the n00bie-n00b, and I think a bit humor won't hurt.
If there's anything I can do to help, mail me.