Aussie needing advice :-)

So I've now found plans for furniture I've been dreaming of buying for an age now. I have (hopefully) converted them to metric. I've borrowed books on woodworking and Australian lumber to help aid me. Now I just have to buy/find the wood! I think I've decided to use MDF as I'll paint it anyway.
The only place I can think of would be Bunnings, but who knows how expensive that would be.
Anywhere else I can find MDF?.
I don't have space to cut so would buntings cut my lengths for me? Any suggestions for places that would supply and cut?

My to do list:
Library cart.
Play kitchen - Stove, Sink and Fridge.
Small locker x 2.

Have I bitten off more than I can chew? Maybe?