The problem with writing a guide like the one you suggest, is that every computer is different, and not just because of Windows versions. For example, if one purchases a computer from one of the major companies, the gunk they load on it will differ, and so will some of the "extras."
Again, the uses to which the computer will be put by the owner will determine what is really essential to add to that computer's hard drive. I would be lost, for example, without OpenOffice.org, but I can slouch along with a relatively basic picture editing application. Others would want the best possible, and get along quite well with Wordpad. Either the guide would include the more basic applications for each task, or include many more in order of complexity; if the former, aficionados would not be helped, and if the latter, the guide would be so complex and lengthy that it would not be very useful or even---at that level---inclusive.
Obviously, everyone should have a layered protection of security on the computer, and this is covered in several places in pinned posts in the forums as well as in the Tutorials. In addition to those, one of the more useful BC "guides" is more a list of freeware applications by category, with very brief annotations, found here: http://www.bleepingcomputer.com/forums/topic3616.html
Computing has become very complicated, mostly because we find new uses for it; as you explore all the possibilities, you will no doubt want the advice of other members who share your interests. Don't hesitate, then, to ask the members with experience and expertise in the different areas, about the "best" applications to use.