How do I go about this?

Please don't berate me or try and bring me down. I am here trying to seek answers, especially from those who are from US. My boyfriend lives in America. I am planning to live with hum, however, I am realising it is more complicated than expected. I want to apply for a working visa, but I heard that it is hard to get if you're not already fully experienced or in a certain career. This will be my first proper job, and planning to do schooling in US after about a year (that way I can go to universities, hear which ones are good and then apply). I know I might be able to apply for a holiday working visa? But I don't know how long I can stay there for? Do I need a job already before I go, or can I look for a job while there? Then do I apply for a working visa later, after I have chosen an occupation? I really need some advice. I don't know how to go about this, and how long the process will take to get approval of the visa. I am from Australia.
How do I go about this?
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