Well i like things such as Japanese foods, the landscape, the language, the customs and traditions, the architecture, the martial arts and the ideals.
I would elaborate but i think it would take too long.
No, please do! How have you learned about the landscape without having been here? Japan is 75 percent mountains anyway, and very volcanic. Where I live (
Hokkaido) is a lot of farming plains and (surprise!) mountains, but down on the opposite end of the country is
Okinawa, quite different. And, then there are the cityscapes, filthy beaches, etc. I suspect you've seen a lot (too many) of travel photos from people.
From Wikipedia and a couple of other travel sites, your own homeland of New South Wales looks far more impressive as far as landscapes go.
Customs and traditions. Bore us, ok? What do you know that you find so wonderful, and how did you learn them without being here? I'm willing to bet you got most from an exchange student (girlfriend?) or watching movies.
Food? Hah! A sushi bar, maybe?
Architecture? What, for example? Shrines and temples? Look at the basic modern city and it looks like London or New York.
http://www.nakasendoway.com/images/2-60-1.jpg
EzineMark
http://upload.wikimedia.org/wikipedia/commons/d/d9/Okayama_City_office_street_2008.2.JPG
http://www.explorejapan.org/photos/nagoya.png
Martial arts and the ideals. If you haven't had some exchange student thrill the cockles of your heart over Japan, this is probably the next most likely experience or exposure to Japan. If it figures strongly in your vision of what Japan is like, forget it. Unlike the stereotype, most Japanese people do not know any martial arts (unlike all Karate Kid movies), and their philosophy on life is not based on aikido or bushido.
As for a job i'm not entirely sure yet, i had previously considered things such as psychology and things to do with computers such as programming.
Psychology means extensive college studies (at the very least a master's degree in both countries), and a heckuva lot of Japanese language. What Japanese person would go to a foreigner for counseling anyway? Answer: damned few!
Programmers are a dime a dozen nowadays, and aside from needing to know Japanese, the foreign people who get hired more often recently are from India.
Go ahead with the working holiday visa inquiry,
The Working Holiday Programmes in Japan
but I really think you should just look at saving your money for a 2-3 week holiday a couple of times before you plan something a serious as living/working here. A WHV lets you do a lot of different kind of work, but with poor Japanese skills, you're not going to get much, perhaps a very low quality English teaching job (unlikely at your age, but not impossible), or bar work (probably only in a gaijin bar at that) or handing out flyers/tissue (not something very lucrative or exciting).