You can get some nice piece of brand new kit for $3K with a single kite!
You'll soon realize that kite selection is all about compromise, kites that are good for one thing (i.e. upwind performance and hangtime) aren't good for other things (i.e. unhooking and wakestyle) and vice-versa. Most beginners typically choose ''all around'' kites which don't excel in any discipline but will allow you to do just about anything as a beginner and gain more skills before feeling the need for a more discipline specific kite.
Being light in kiting is a huge advantage, you can get going in less wind and you don't need massive kites. Small kites are much more fun (and cheaper) than big kites. Anything above 10m is just slow and not as fun. When you get in sizes below 9m, you'll find just about all kites are pretty fast.
Where you live doesn't often get over 20 knots, so perhaps getting something around 8m and a bigger board (i.e. 133-136cm) is a good idea to start with. With that sort of kit, you may be able to get going slightly below 15 knots up until about 25 knots gusts max. Trade winds in North QLD are always more gusty than other winds like the sea breeze for example, you'll often have at least 5 knots variation on any given day.
The more skills you get, the lighter and stronger winds you'll be able to go out in using the same gear.
You may get better advice just by talking to other girls who kite in your area and are of a similar weight than you.
I've noticed a lot of guys don't give good advice about kite size and board size (even in shops) to very light riders like yourself and therefore often end up on massive kites (10m) and massive board in strong winds...

. Being 30 kg lighter than the average kiter out there makes a
huge difference in size selection