If you are interested in installing and using a Unix system based on the Linux kernel, you won't have any problem in finding all the documentation you need. In fact, there exist several excellent books that teach how to install Linux and how to run it. Furthermore, many courses are taught in many countries on the same topics.

If your problem is how to modify the Linux kernel and how to evaluate the impact of the changes you made (we call this kind of programmer's behavior kernel hacking) then

Auth against any of the OpenID/Yahoo/Google/Facebook/Twitter/Meemi... into your local login manager (when network is available otherwise use the classical mapped local login user).