Hi Pog,
Welcome to IIS.
Check out your local library. There'll be plenty of astronomy books there.
Maybe the school library too.
As stated above, stellarium will help you get to know the night sky, and get a
planisphere, I think you can get them at the Australian Geographic shop. Then get out with the binoculars and start finding stuff.
I see you are in Adelaide, so here's a link to the Astro Society of South Australia. They will have viewing nights you could maybe talk your mum into taking you to.
www.assa.org.au
And if you think you want to be a professional astronomer (or astronaut for that matter) pay attention in maths, physics and chemistry classes. They are
hugely relevant to astronomy.
Molly.