There are a number of resources with basic information about advance directives. These resources may also include fill-in-the-blanks forms you can use.
Please note, there is no standard form for a durable power of attorney for health care, or an advance directive for mental health care.
You always have the option to consult with a lawyer to have documents drafted for you.
If you wish to read the following resources, click on the name and you will be directed to that publication.