You only need the usual VISA stuff for serial port access. The rest is pretty simple.
I have some labview 7 code somewhere that I used to talk to an arduino board. It was used to poll a few sensors on a stepper motor stage. Labview sends a single letter to query the board and gets back the current counter value for each sensor.
I've attached a zip with the labview code and the arduino's firmware. It uses a now obsolete library to talk to a MAX7221. You can throw that one out, as it's only for a display and not needed for the serial stuff. You'll get the idea how to get going.
The 'tester' .vi is used as a stand alone, whereas the other .vi is basically the same, but integrates easier with others as a sub-vi.
Now you only need a demo version of labview... Maybe National Instruments still offer that. I have a book named 'LabView for Everyone' that came with a demo I think. Quite a few years old though. But the basic serial I/O using the VISA stuff is pretty basic and should work. It was in version 5.1 as well, and that is well... stone age ;-)
This is the back panel spaghetti code: