After you arrive
Ok, when you arrive, the first day you'll get an induction - talks from the Cabin crew team, HR, a fire talk etc and get your uniform fitted. Lots of forms to fill out and hand in.
The second day of induction will include a picture for your ID, plus you'll get some blood taken for testing
After a few days you'll have the medical, where it's pretty much testing and confirming the medical you submitted before flying over. Basic Neurological, Optical, Audio tests. Try and avoid taking Panadine or Nurofen plus in the week before, or anything with codeine as this will show up in the urine test. Any missing x-rays will be taken at the medical centre and deducted from your salary.
You will probably be placed with existing flatmates, and they can vary from crew also in training college, to crew who are SFS's. When they place people together they try to get crew of the same country together, smokers with smokers, etc. But even if you don't get on, you have the option of moving free of charge within the first year of employment.
Hope that helps