Reply to @R_Yell:
1) apply for skills assessment first, and of course your ielts
2) submit your EOI-Skillselect,
3) In your EOI, you can specify here if you want to be nominated and which state, from here, you state can select you kung gusto ka nila..
4) Or pag meron ka ng EOI reference number, pwede ka mag apply ng sarili mo sa mga State, you just need to provide to them your docs (skills and ielts)... please check the other thread on how to apply for each state..
pag na-approve ang state sponsorship mo, may additional points, and then they will nominate you sa skill select, at mas mapapabilis ang invitation mo to apply visa..
regarding IELTS, i answered your question sa kabilang thread... pls check..