Estate planning is a complex process that requires legal knowledge and informed decision making. Do-it-yourself kits are available from a number of sources, but they may not be accurate or sufficient for your needs. Forms can be found at office supply stores, or can be purchased on the Internet.
The Northwest Justice Project has forms for Living Wills and Powers of Attorney on their web site. These free forms are accompanied by careful instructions.
The Washington State Medical Association has forms for Advance Directives: https://wsma.org/advance-directives