If your in Vic then you might want to consider a slightly larger kite. From the gear you listed it looks like your wanting a twin-tip setup so not going to be wave riding.
If your really new to kiteboarding you probably want to be getting a lesson or two
before you buy the gear. Once you've had a lesson you'll know what sort of kite you want to fly, and what size/style of board you prefer.
Based on the 'average' rider being ~80kg (plus a few kg when wet), for the majority of Victorian conditions your going to want a 11-13m bow/SLE kite, and a ~135-142x41 cm board to get you up and going as quickly and safely as possible. Once you've progressed a bit i've been told you can use a smaller board, but for starting out you want something that planes nice and early to get you out of the water quicker.
Which beach are you planning on doing most of your kiting at?
Best way to see what sort of gear you should be using is head down to the beach when the wind's blowing and see what everyone else is using; but as i said, most Vic riders use ~11-13m kites for our conditions.
edit: 45kg?! Woah. Ok, a 10m kite and a 133x40 board should do ya fine. At only 45kg you probably don't want to be going out in anything gusty when your starting out.