Planning for world journey, Part 2

So now I am getting ready to leave for Brisbane in just a few days.  I have reserved a hostel there, but nothing yet for the rest of my visit to Australia; I will mostly wing it.  Then I plan to journey to Beijing, where I will stay for a bit before I take the Trans-Mongolian Railway,  From Mongolia, I will continue into Siberia, where I hope to take the Trans-Siberian Railway, but I only have the first leg booked.  After I enter the Republic of Buryatia, I will plan the next phase of my journey.