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Right now I have the following input box that works fine and well, however I would like to wrap this is a loop that requires input. Right now the script will happily continue on if the user just hits enter. I'd like to require a minimum of a 5 digit number or n/a or N/A as the only viable options otherwise you should get prompted to re-enter information.
Maybe I'm missing something, but it sounds like you already have your solution. You know that you need to use a loop, and you know the condition(s) that should cause your loop to end.
If you're imagining that you're still missing "a piece," the only thing I can think of is the (optional) use of a "flag" variable to signal success/failure. What else do you imagine that you'd need?