The age of majority in Washington is 18. Suddenly new rights, responsibilities, opportunities and risks confront the new adult. How do you deal with all these things that were not on your radar before? Reading some of the material here will be a good start. Conversations with parent, other adults and friends will also help with figuring out what the questions are and where to look for the answers.
The young lawyers in the 2009 class of the Leadership Institute of the Washington State Bar prepared an excellent tool to help you. It is called "Your Guide to Turnign 18". It is attached at the end of this article. The guide has not been updated since it was created, so keep that it mind. It is also not a substitute for getting legal advice from a lawyer.