Hi
I will keep this post general and deliberately basic, so, please bare with me if I do not go into as much detail as you might like....
A superannuation fund must invest for the future. That is, it should not allow the members to benefit from the fund or its assets in any way. Therefore, a couple of examples might be that the fund cannot buy artwork and hang them in your living room; or, buy a golf membership and allow you to play golf using that membership.
A superannuation fund cannot borrow money...at all.
A superannuation fund must have an investment strategy of how the funds under management will be invested. Then, the fund should actually invest in accordance with this strategy.
A superannuation fund cannot pay a member or trustee for managing the assets of the fund or for any other creative reason.
A superannuation fund cannot operate a business of its own.
Other than that, a super fund obviously has to lodge tax returns every year and have the financial statements audited every year.
That is about it. The tax office have a couple of handy booklets that are worth reading. Try here:
http://www.ato.gov.au/super/pathway.asp?pc=001/007/122&mfp=001/007&mnu=2213#001_007_122
Have fun
Dale