We don't have documentation on the individual sample programs, but you can find a general Labview guide here
If you want to learn the functions of each of the items in the block diagram, see our online API manual here
As a side note, while Labview might seem like the simplest programming language, it is generally quirkier and more restrictive than other programming languages. If you're learning from the ground up either way, then you might want to choose a more popular language such as C# or Java. You're more likely to find programming help with these languages, both here and other places on the web.