HELP ON VISION PROGRAMMING BASICS

Hello! I am having a lot of trouble of understanding how to program the vision system. I have looked at the examples that Labview gives -the ones that were dealing with the 2009 competition - however I can’t make head or tale of the hows and why’s of the example codes. Could anybody give me some basics in vision programming, I have never done this sort of programming before and I have no idea on where to start. Thanks Alot!