Most of the mandatory pattern forms for family law proceedings for WA is free at http://www.courts.wa.gov/forms/ . There are instructions at that site. Click on WA LawHelp for more detailed self-help guides.
Printed blank forms can be bought at the county's superior courthouse for about $30 a package.
Most counties have family law facilitators who help fill out forms for no or low cost. Their offices are usually in the superior courthouses.
Attorneys can help fill out agreed dissolution documents.
Sign up to receive a 10-part series of useful information and legal advice about the divorce process.