There is no structured tour unless you take the extra tour of the Spruce Goose. The rest is free form after you pay admission.
Yes There is the cost for a adult is about 30.00 dollars so take your time and have fun.!!!!a little less if over 65.
https://www.evergreenmuseum.org/
You don't have to take a tour, but the guides to have cool stories about the planes
There is general admission. And you can purchase movie tickets and such for there 3d IMAX films if you want.
Thanks! Your answer is awaiting moderation.