I am hoping to create a writing competition. Let's assume the competition is a short story competition with the prize being $1000, with a $10 entry fee, available to only Australian residents. Apart from putting clear official rules- e.g. this is not a sweepstakes, criterion by which it will be judged, entrance date etc. is there any other issues legally from me doing this? and what if I chose to make it available to interested story tellers overseas- does that change the game plan since different countries have different rules around 'windfalls' in tax etc.etc.