I'm going to assume you have LabVIEW all ready to go and everything.
http://www.ni.com/academic/lv_training/how_learn_lv.htm
These should give you the basics. I had use Robolab for FLL before FRC, so I was already used to the program flow with LabVIEW.. but to learn how to do stuff, I thought of something I wanted to accomplish and I did searches to see what I needed to do to do it. I think I was able to do this because I was already used to a LabVIEW type environment. So the URL I said above should help you.
But still C is good to know. It's different, but as a programmer, it's good to know (even though LabVIEW's flow is much different).
Last year we used LabVIEW for our diagnostics (which will be interesting next year.. so much more information.. and 128M of flash! =O)
http://www.google.com/search?q=labview+tutorial
Just poke around. It'll give you a start, and from there you can dive into more interesting projects which'll give you more specific questions (instead of "How do I program?" it'll become "How do I loop until this action?")
One of the first things I did in LabVIEW was to make it connect to an IRC server, send a packet which made it join a channel, say something, and leave. That's all it did. At this point I could probably make a basic IRC client. Hm.