Overshooting? Carry on with your flight training and you will learn how to land a plane. Your instructor will teach you how to set up a good approach, judge the round-out, and fly it down to the touchdown.
As I said, research and plan your trip, including what you are going to do at the destination and how you are going to achieve it, this includes local transport options and accommodation if applicable. The internet is a wonderful thing. I'm about to embark on getting my xc endorsement to be able to do this very soon, I'm studying the material now.... I'm looking at some interesting trips like Great Keppel Island, Fraser Island, Hervey Bay, among other destinations.
So you were rejected for the RAAF? Don't let that bother you, they reject a lot of people. Join us others who wanted to fly and just pay for it, you can do it a lesson at a time, you will not regret it. Learning aviation is awesome from start to finish. Careful though, once the aviation bug bites, it doesn't let you go