Q. information about applying for residency if the ENS is not applicable.Am I elgible to apply by myself and when would I be eligible?
A. Applicants can apply themselves for any visa without using an agent
But you do need to select a visa for which you will be eligible otherwise that is just like throwing money away.
Have a look at
www.immi.gov.au and there is a Viza Wizard there that may help you.