If you really want to trade options then consider switching to US options. The brokerage is much lower, contract sizes are smaller, and the spreads are tighter.
But if you are trading directionally then I would question why you want to play with options. CFD's will give you good leverage, better position sizing ability and no time decay. $5k in a cfd account is plenty to start with and most brokers offer min $10 commission on aus stocks. You could easily position size for a 2% of account risk per trade which will keep your risk per trade relatively small.
Best of luck.