I am not an attorney and cannot advise on nor prepare legal documents. However, here is a short list of sites for self-preparation of legal documents:
 
12 Law

FreeWill

Law Depot

Legal Zoom (trusts, wills)

CA Advance Healthcare Directive

Monterey Hospice Giving Foundation

NOLO Press Legal Forms

Parental Consent Letter

POLST (Physician Order for Life Sustaining Treatment aka DNR)
 
Multistate PREPARE Advance Medical Directive

Rocket Lawyer

Sacramento County Public Law Library (free fillable forms)