Check your states website. Most states have the forms online. I did my LLCs on a PDF and printed them, mailed them in with a check and that was that. It really isn't too hard. You may also want to look into a few states that have sales tax benefits like Oregon being that it is close to you. Makes it easy. With an LLC you can also pay taxes on a schedule attached to your 1040 so that you do not have to pay taxes as a company then pay individual taxes for what you pay yourself. Some states charge a flat fee if you do it that way. Here in CA if you claim LLC income on your federal 1040 and state tax form you pay a flat $800 franchise fee per year.
Here is the PDF form for WA -->
http://www.secstate.wa.gov/corps/forms/llc.pdf
Fill it out print it and send them 175 bucks.
