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Nondisclosure agreements (NDA’s) are important tools for inventors.  The importance of keeping a good idea a secret cannot be overstated.  If you are an inventor and you are seeking help with your invention from anyone, have them sign a nondisclosure agreement.  If they won’t sign one, get your help elsewhere.  Nondisclosure agreements are easily obtainable both online and in inventor’s literature (NOLO’s “The Inventor’s Notebook” includes a tear-out “Proprietary Materials Agreement”). 

The exception to this rule (the ruling being that nobody learns your idea without signing an NDA) is your attorney.  A patent attorney is bound by the rules of professional conduct which require a patent practitioner to preserve the secrets of clients.  Hence, a NDA from a patent attorney is superfluous.  You can still have your attorney sign one, but it is not really necessary. 

Here is a link to Canon 4 of the Code of Professional Responsibility for  Patent Practitioners.  I'm not going to link to any specific NDA.  Many are available by Goggling "nondisclosure agreement."