You are not naive, you are only young, ja ja
Hi Nicola, I live in Argentina , I have 35 years of moto in my ass, 20 of them travelling , specially very often in the last 10 in Europe, Africa and of course south america.
You have some very important things, -all you need- as your age, your dreams, and a little piece of madness. ( That is goog ,ja ja )
I think wath is not very important decide now or this year where to go. You must take your moto and ride all that you can in Australia , that will open your mind very much.
Finally, you can do all the destinations !!!!!
Perhaps you should begin by Europe, more easy, less dangerous and very interesting. Then North and South America, finally central america. CA like Africa is really nice, you have very different places, some very goods, some very bads and dangerous. The difference is your experience.
The best, even the only way at last is in your own motobike.
I have a daughter going to Australia for a year in november.
If you come, here in Argentina my wife and me can wait you at home if you want. Sorry my bad english !