Cabair
I've just finished there. Your group will consist of people who have just finished the 7 week course (8 exams) and new people like yourself (starting on the 12 week course). There is a proposed number of 20 for the group(inc 2 women). The remaining lads are all very friendly. You will be fine.
Don't be expecting any great formal introduction, I think you have to be there about 8.15 and the first lesson is at 8.30.
Good luck!