You really need to seek the advice of an accountant.
You need to decide if you are a trader, or an investor. The ATO will fine you if they don't agree with you at audit time. Not a nice process to go through.
Trader, the shares are treated as your "stock" for the year. The gains (or losses) are treated as income for the year.
Invester, whatever gains you have are a capital gain (or capital loss.) Buy and hold type strategy.
Traders lose the ability to claim 50% reduction of capital gain if stock is held for more than 12 months. Traders gain the ability to apply losses against other income and this is where you may come unstuck with the ATO.
