1. Don't be scared. You will be on the manifest. You should have received an e-mail or fax from your TA with your booking number. If not, snarl now and carry that info with you.
2. It's been that long since you've been to a funeral and trotted out the old suit? You can rent a tux (you can do it online) if you really want to get tricked out. At the least, a coat and tie would be good. But I don't think the Fashion Police will come after you if you look neat and tidy.
3. Casinos are open only when at sea and outside the "three mile limit" if memory serves.
4. Have a fabulous time. If there's anything else we can help with, just holler.