I would recommend starting from an existing FlexRIO example. If you go to example finder from LabVIEW (Help>>Find Examples...) you can then navigate to Hardware Input and Output>>FlexRIO>>IO Modules>>NI 5783>> NI 5783 - Getting Started.lvproj
There is one host VI and you can expand whichever FPGA target you're using and see how the FPGA VI is configured. All FIFOs are stored within the Resources folder.
Shalini M. Partner Development Engineer Alliance Partner Network National Instruments