Pickled Ginger's answer is really great, so I'll just add that you're going to find that you live in a very gluten-free-friendly corner of an increasingly gluten-free-friendly world. I'm a third generation gluten free person, and it is a thousand times easier to be GF now than it was back when my grandma was diagnosed. There are tons of products in the stores, everything is labeled, waiters know what the hell you're talking about, and places that you'd never expect to have GF options (like bakeries and sandwich shops) now do, so don't be afraid to ask (but also, if they say no, don't be one of those entitled gluten-free jerks who acts like the world owes them a cupcake.) Be a gracious dinner guest, communicate with your hosts, offer to bring something, etc.
It's a transition, for sure, but it's really not that daunting once you get the hang of it. Focus on all of the things you CAN eat (there are a lot!), be adventurous, and you'll be just fine.
I second the Udi's recommendation. Also Tinkyada pasta is excellent. And there is a new GF pasta-maker - Manini's - making the rounds at the farmers markets. Best fresh GF pasta I've ever had. Seek them out!
Last bit of advice: you will try gluten free versions of things that will make you gag. Don't give up on that thing or decide that it's not possible to make a good GF version - just try someone else's (or make your own). And Shauna Ahern (glutenfreegirl.com) is indeed a great resource.
Good luck!