Very early in the game, someone sitting outside a trailer tells me to
unlock the windmill in the kitchen. Where is the kitchen? How do I get
there? Is it in the trailer? How do I get into the trailer.

Hi Guterman, I was in the cyan private alpha and ubi public betas for
the game. I'm not familiar with this windmill reference, so it must be
pretty new. My guess would be the kitchen they're refering to is the
one in the fissure, near the volcano. Look around the volcano for a
big whole in the ground. Use the ladder to get down there. Spend some
time there before you go through the linking book, because once you
leave you can't come back, and the place has some really awesome
sights, especially for fans of the novel books (such as myself). Good
luck in D'ni!