In my opinion you have an excellent plan of attack Parkway. You will love the study, it's a fascinating subject, it will push your mind. The flight sim.... yes, you can effectively test your xc skills by using it, I did. One memorable occasion was when I had to plan for a flight from Coominya(YBCM) to Millmeran(YMMN). I thought I'd practice some XC skills on the sim, the day before. I thought, Damn! this sim is no good, there's no good landmarks on the way, the river that is on the map, isn't there. oh well, just stay on the bearing, keep the time markers up to date, then a large lake came into view right on queue, and I knew where I was. When I did the flight for real, I was impressed just how void of landmarks that stretch was, the rivers that were supposed to be there, were hidden by foliage or dry and unrecognizable, and like the sim, I just held the bearing and just like the sim, the lake came into view, right on time.
The study material has some very good practice exams that prepares you well for the RAAus XC exam. When you get the Study material, make sure you invest in a flight computer (Kane MK6B is used in the study material, I inherited my fathers 6B who purchased it in the 1960's, it is still good and relevant) and aviation rulers and protractor. The study refers to them often and you will not understand some of the concepts unless you have one in your hands. Also get yourself a copy of ERSA, VFRG and up to date charts of the area around where you are going to fly(VTC, VNC and WAC), closer to when you are planning to start your training. A PCA helps you interpret weather reports. Your instructor will advise you, before you start, of other gear you may need.
There are a lot of concepts to get your head around, but for me, it all came together when my instructor said, "You just have to follow the snake" The snake being the series of pinpoints you make along the path to your destination.
As I said, you will love it!
Tony