I wouldn't generally recommend getting a board when you've only been a few days, I've been riding a few days a season for 9 years and still don't have one, but I'm a cheapskate, and I live in the south (no snow). However, I can't tell you how glad I was when I finally got my own set of boots. You live in Seattle, so you should have plenty of places to go try them on. Find a pair that fits quite snug but not cramped, and is comfortable walking around the shop for about an hour or so. A good-fitting boot will be supportive and warm, and anything decent will keep you dry. Up to you what kinda flex you're looking for.
But as people always say, bad-fitting boots guarantee a bad day, and nothing will help you have more confidence, comfort, and control (thus allowing you to progress) than a good pair of boots. I would say to get boots before you get anything else, I wish I had gotten a good pair years ago (though I wouldn't have had these Nikes I love so much now). They'll keep you from worrying much about the rest of your setup, and give you more time to ride, progress, and develop your style and tastes, which gives you a better idea of what kinda board and bindings you may wanna look at.