How do i read LabVIEW commands into my Arduino

Want to send information from a user interface such as LabVIEW so the microcontroller can output the commands.

RGB lights on PWM
Motor speed PWM

Starting from scratch?

Robin has written the "serial input basics" thread that can give a start for the Arduino side of things. Do a search.

Once you have that in place (you can test using serial monitor), you can write the other side.