I need a tutorial , preferably with pics/diagrams to get oriented to how a typical Linux distro. is organized and used (including the basic software installation work flow). It shouldn't be a 500 pages book. A concise 20-30 pages tutorial is what I am looking for , so that I read it over the weekend and just dive into Ubuntu/Fedora etc and figure my way around on my own.
But to be honest, if you are going for something like Ubuntu you will find it very easy, and if you don't, there is a stack of info over on askubuntu.com, including this question which should have what you'll need.