Overnights vary as do the hours. Some get 100hrs some are getting 160hrs. Overnights-between 0 and 10. Ive been getting an average of 5 a month. I know the guys up in melbourne and sydney have been getting loads of hours and overnights. For the actual hours that you work they pay is pretty good incase anyone is worried they wont make enough.
When you start flying depens on your roster. You may have a week of Available spans and not get called, therefore you wont fly. For me, I finished up on the 28th, started flying on the 1st.
Training takes place when ever they can fit the class in. You may be lucky and get a class that doesnt have to do any late nights. It is done on weekends, public holidays etc. For us we had bad times, some of our finishing times werent until 1am, 2am-even had one day when we started at 10pm and finished 6am