I use the TR White Paper for outside Consultants as a template for security purposes it just basically says that I'm not going to talk about this companies business to anyone else unless ordered to by a Court for Legal purposes.
For general Work this also depends on where you actually are in AU and can range from $50.00 per hour up to whatever level of service you are offering.
As for legislation there isn't any yet but you may be asked soon to sign an AWA which isn't something that you should consider as you are a consultant not an employee. But with the proposed changes to IR coming in with the current Federal Government it's currently anyones guess as to what is going to happen. Once the legislation is actually written it will be easier to work out what the Federal Government is actually up to but before that I would just stick with what you are comfortable with and what your customers can afford. For basic Install work $50.00 Per Hour is a good starting point but if you are offering any specialised services the hourly rate will be greater.
Col ]:)