Nothing to worry about chaps. You'll be given everything you need to know in order to pass the air law and perf A exams.
You'll meet all the wheels and office staff that you'll need to know (rostering, personnel etc). Everybody is very friendly and welcoming and keen to give the impression of a happy company.
The rest of your time will no doubt be spent in Wanchai!
The 747 conversion course is at Burgess Hill and again you'll be given everything you need to know. You won't sit the CAD exam until you go back to HKG for Base Tng.
Enjoy your time in HKG and welcome to the company.