Do a search for the threads on here...D&G General Aviation & Questions has a thread running on QCCA, and MAM threads have been here before.
MAM = Maurice Alexander Management = casual FA employment in Short Haul
QCCA = Qantas Cabin Crew Australia = permanent full time employment in Long Haul
QCCA employing many crew now and in the future, so the way forward, in my opinion, is QCCA.