yeah exactly what hoon69 said start from the bottom and work your way up
also try those job sites...
www.careerone.com.au umm search google he'll tell you most of them
otherwise since you already have the card why not try an apprentichsip/traineeship in construction or ask someone a builder/carpenter for a job/apprenticeship - pay will be low and crap and hard work ( i did it for 2 weeks and it sucked) but when you know your stuff you will get paid higher
or come to innisfail theyre in short supply of builders/carpenters ask them for a job