I just want to be a FO on the A320's for Jetstar!!!
Don't aim too high, you might strain a muscle,
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Why Jetstar? And why the rush? What's wrong with enjoying aviation as you go along, and gaining some quality experience. Rather than rushing through aviation as quick as possible (this can speak volumes of your flying as well in my opinion) just to get into a jet.
Hard to say what the quickest path is these days, because the pilot shortage is slowing just a bit. So what could have been the quickest path 6 months ago, might not be now.
I'll hand over to those with a bit more knowledge on the "quickest" path.
morno