do your course first before buying lots of gear. you may hate diving and become scared / paranoid under water. i had students who spat their regulator out and that at 12 meters due to panic!!
its also a good idea to do the course in NZ waters. you can dive here you can dive almost everywhere!
also if you plan on a holiday to go diving and only do a couple dives a year (5-10) you more often better of renting your equipement.
some dive shops especially before christmas offer quite a few deals (combo's that include 1st, 2nd stage, bcd and octopus).
so no impulse buying (but you as reefer should be able to resist that anyway 8) )
good luck