Welcome from Australia.
Every decision you make from now on, will affect your suitability for LE.
Do not do drugs.
Do not hang around with people who do drugs.
Do not commit any offence, no matter how small it is.
You want your application to be spotless, and I mean SPOTLESS.
You want to confidentally go into a poly test with nothing to hide, and nothing to regret/admit to.
Try and get as much life experience as possible, and Military is great for that.
Expect failure on your first, second and third tries. If that is the case, keep trying. If you want it bad enough, you will get it. If you are lucky/good enough to get in first try, even more luck to you.
Use the search function here at RP. It will lead you to a wealth of wisdom.
Good luck with your pursuits.
"He didn't want to tell the cop he was on his way to the Butt Pirate Palace for a little two-step with Joe-Joe during the Village People marathon." - Cat_Doc
"Cause when your hourglass runs out of sand
You can't flip it over and start again...Don't blink..." Kenny Chesney
"Take care, never leave home on bad terms, watch your back and go home in one piece." - Aussie Nathan
"The batton in my jacket is hot like a porn actor to beat someone down." - Patchcop