yeah, if you're from sydney.. its best to have transportation there and home as it'd be a little tricky trying to get public transport home at 3am
my ground school finished on a wednesday (got my roster the same day) then i was online on saturday (so 2 days off) some people in my group had flights right away on saturday.. others like me got airport reserve so it varies!
i actually didnt find ground school that tough... i think it was just because i had great trainers and they made everything so clear to us therefore we found everything quite easy
in my opinion, i think its better to start flying right away after GS finishes.. cos then everything is still fresh in your mind and you can just get into it right away!
good luck!!