As you say, there is plenty of material on the internet.
I'd suggest starting with the NI fry training site ...
https://decibel.ni.com/content/docs/DOC-8923.
Or if you prefer movies, try frcmastery.com.
These will lead you through using the default code and explain how it works. Then they will lead you through making small modifications to add a sensor or turn arcade into tank. There are many examples that ship with LV, and learning to use them to explore the WPILib functions is pretty key to quick progress and good understanding of what your code is doing.
Once you get the basics down, you should have little problem downloading code from other teams and sites and making enough sense of it to determine how to integrate it successfully.
Greg McKaskle