If you are new to LabVIEW, I would recommend going through some tutorials first to get familiar with it. It looks like there are some examples of LabVIEW code for Mindstorm on the lego engineering website below:
LabVIEW also comes with detailed and commented examples to help you understand the language. You can find these by going to Help->Find Examples, and browsing or searching for an example related to what you're doing. Some Mindstorm examples may be bundled with the module, so I would search for a Mindstorm example there.