"Is there a free form for a medical power of attorney? If so, may I have a copy."
For more guidance and more sample forms, see the book "Living Wills and Health Care Proxies: Assuring Your End of Life Wishes are Respected". Authors are Shenkman and Klein. You can get it on www.amazon.com.
Be REALLY carefully using any standard forms for this. Everyone has unique personal wishes and standard forms can be quite contrary to what you want. There is perhaps no legal document which should be more personalized than the living will and medical power (or health care proxy, whichever name you prefer). Good luck and let us know if you have any specific questions when you review the sample forms on the Estate Planning section of this web site.