Hi Tina, you're first class may seem a bit chaotic (this is if it's the first week for the whole of the group). You'll all sit in a room together and be given a piece of paper on which you choose the packs that you want for the first week - 28 packs/4 per day (no bars for the first week).
One by one your counsellor will take you into a separate room where she will weigh you and measure your bust, waist and hips. She'll record all this and then give you a book with the details in. You'll also have your photograph taken, a front shot and a side shot - she will keep these and when you've done your 100 days you'll have your photos done again so that you can see the difference, and believe me you will see a difference.
Once everyone has been weighed and measured you'll watch a dvd and have a counselling session - don't be surprised though if this is very short as depending on how many people have joined there might not be much of the 2hr session left by the time you've all been in.
Good luck, enjoy your class and let us know how you get on.