I moved from the UK in 2008 to California
Things to do. You have most/all of them all ready
Build Credit - Takes a while to get a good score. My first car I brought here I could only get a crappy rate (12.9 but now have a 3.75%). Good use of CC's is important
SSN - What a pain
Driving License. Also get used to the roads.
Get a gun - Was very simple process
Find a way to get your British sport
Weather was a shock for me. California is lot hotter than London. I arrived right in the middle of Summer. I was tempted just to turn around and go back home. But after forcing myself to go out in it I soon got used to it
Oh and get used to the idea that can NOT walk 5 minutes from your home and walk in to Ladbrokes!
And one I thing I did not expect was how my accent would effect the ladies. To bad I'm married