Yep, I hit 30 days myself yesterday and started doing FastPasses yesterday...since I'm offsite, I can only do one day at a time. So far, so good.
I think you're in pretty good shape. Good idea on checking on the Magical Express. At some point, they should send you luggage tags...but if you go with just a carry-on, that won't be an issue.
You probably should print out a copy of your airline itinerary, just in case. Most airlines don't do the actual checkin until 24 hours prior to the flight, so you won't be able to print out your boarding pass yet. Even then, if you were to forget it, you could reprint at the airport. Having that 6 character confirmation/booking code is the most important thing. Some airlines (maybe most at this point) also have the option of getting the boarding pass online, so you may not have to print at all. If you do that, be sure to have a screenshot of it, just in case you happen to lose your signal in the airport.
Of course, make sure you have My Disney Experience on your phone and working. You should see your tickets, hotel and fastpasses there. That's also how you can pick up additional fastpasses onsite. Also it wouldn't hurt to have the app for your airline loaded too.
Forgot about Flower and Garden...I'll have to leave an afternoon/evening or two for eating around the world...