Your question is very general.
An "infinite" loop is a while loop, which can be found in the Structures palette.
You can implement FIFO queues yourself by using arrays, or use the existing queue VIs (Advanced>>Synchronization palette).
In general, I would like to suggest that you try to learn the basics of LV. To start, try searching this site and google for LabVIEW tutorials. Here and here are a couple you can start with. You can also contact your local NI office and join one of their courses.
In addition, I suggest you read the LabVIEW style guide and the LabVIEW user manual
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