Butfli: Your VERY FIRST STEP is to front up at a couple of flying schools, try Parrafield and Aldinga and meet some flying instructors then have a go. All your questions will be answered along the way. If you are not a self starter you will not get far.
You yourself need to research both RAA and GA schools and yes, you can hold an IFR rating on a PPL but your first step is to get the PPL and some hours up.
Enjoy!