Australian immigrants seek help.

To answer your second question first, if your girlfriend marries you, you will have Australian citizenship, so your parents can apply for visiting relatives. Finally, there are different kinds of visas. Work is a work visa, and immigrants are immigrant visas. How long the stopover is varies from person to person. Finally, to answer your first question, your purpose is to land in Australia first. In this case, if you apply for a visa, it actually depends on your personal situation (the type of visa mentioned earlier) and what kind of visa you are suitable for. To put it bluntly, it is a question of how you can sign a visa with a higher success rate. So no one here can give you a definite answer, only what kind of visa is more suitable for you (depending on your specific situation).