There is only a few other tack shop I can think of one is Nagmart in Maddington. I haven't been there in a few years though, I usually go to Horseland in Perth but now finding that they don't have much stock and take a long time to order stuff in so I find that I'm going to Horseland in Maddington now.
My saddle came from Saddles Plus Perth which is in Byford, very good quality stuff there. Too much of a trek for me though to get there.
If you are one facebook try Buy/Sell Horses and Tack Western Australia, great for second hand stuff and tack shack is another online tack shop based in QLD.
Equipment just what is stated above and it depends on what is included in the lease. I brought my horse a couple of months ago and just buy when I need something really. I love visiting tack shops my guilty pleasure lol