You should be excited, but lose the nervous , because you're gonna do great! Just take it one day at a time for right now. You'll get into the swing of things in no time!
The most important thing you can do for yourself, well, other than the food and getting some exercise in, is to make this place your home as well. Talking and sharing and encouraging each other, I think, is a vital key that is SO often overlooked when we start a life style change! The more you share, and reach out to others, the more of the same comes flooding back in YOUR direction when you need it most.
There's no one here who doesn't have a very good idea how you feel right now. So, take heart, and full steam ahead girl!