Reddit reviews How to Write a Dick: A Guide for Writing Fictional Sleuths from a Couple of Real-Life Sleuths

So first:

https://www.amazon.com/How-Write-Dick-Fictional-ebook/dp/B00595K1UK

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That's written by a real private investigator who is also an author.

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In terms of things people don't know or get wrong:

• We don't break the law - at least not if we want to stay out of prison/keep our jobs.
  
• We're as likely to be working fraud cases as domestics or criminal defense.
  
• In most states, you can't be licensed without investigative experience measured in years.
  
• In any state that licenses, any criminal history is going to be a problem, if not a prohibitor.
  
• We don't drive Ferraris or Porsches generally speaking (though I am hoping to one day change this)