When my midwife discovered twins at my 7 week sonogram, her first piece of advice to me was to read When You're Expecting Twins, Triplets, or Quads. The second I got home I requested it from the library and read it within a few days of receiving it. It's the perfect starting off point to inform you and open your eyes that this is no "regular" pregnancy - there are risks, but you shouldn't be afraid. Knowledge is power!!
Keep in mind, however, that these birthing classes are usually focused on first time parents having ONE baby. Birthing twins, either vaginally or via Cesarian, is a whole other ball game, and for that you need to take a twin specific class. I took two recently and can't recommend either of them highly enough!!
Twiniversity runs two different 3-hour classes on the first and second Monday nights of each month in New York City, led by Twiniversity's HILARIOUS founder, Natalie Diaz. Their 101 class covers everything from what items to include on your baby registry, to what you can expect during a vaginal or Ceserian delivery, how to find a nanny and pediatrician, and how to deal with NICU time. Their 201 class covers things for the babies' first six months, like how to breast or bottle feed, sleep train, diaper, travel, etc etc. Each class is $160 per family, includes a fabulously yummy Italian dinner, and you'll be sent home with a big bag of swag, including pacifiers, bottles, and Natalie's best-selling book, What to Do When You're Having Two.
Twin Love Concierge (TLC) offers "Expecting Twins" workshops in the Tri-State / New York City area (Manhattan, Brooklyn, Lower Westchester, Northern Westchester, Connecticut), Los Angeles (Hollywood & Pasadena), Boston, Miami (South Miami & Biscayne), and Houston. The 2-hour class costs $105 per couple and covers everything from what gear you do and don't need, preparing for the birth and NICU, what to expect in the first few weeks, and techniques for breast and bottle feeding. You'll be added to a private Facebook group of TLC grads and be sent home with a Parent Pack of useful information and helpful charts. In New York City, TLC also offers a 3-hour long "Bringing Home Babies" class which is a combo of the above twins prep and a RN-led birthing class specialized for twins, a great option for those in the NYC-metro area!! It costs $250 per couple.
You should definitely search out your local twins group, and depending on where you live there might be several. You can do a search on the Multiples of America site, or ask in the above mentioned Facebook group for a recommendation in your area. My local group is run through Yahoo and charges a $20 membership fee, but the amount of for sale and for free items being offered via e-mail every day more than makes up for the joining cost! You can seriously find just about anything you need - you shouldn't have to pay a cent for your double snap 'n go stroller, those are a dime a dozen in these twins groups! I snagged a My Brest Friend Twins Nursing Pillow for $20, picked up bags of maternity clothes and a baby swing for FREE, and am lined up to get a matching set of 2 Pottery Barn cribs and changing table next month. SCORE!!! Not to mention you can arrange meet-ups and make lifelong friends with some of these families.
So, the quicker you can come to terms with it and not only accept but be happy with the new normal, the better! Cuz... TWINS!!! That is freaking AMAZEBALLS!!!! Welcome to the club ^_^