For first aid do not bandage the bite as this concentrated the venom which is less efective if you let it dilute in the blood, however you should apply iced water to the site and take painkillers to manage the symptoms (exotic pain) and seek medical attention. There is an antivenene.
The CSIRO recommend that
you destroy the spiders as you find them. Poke a stick into the retreat to squash or remove the spider, and destroy any egg sacs. Take care not to be bitten.
I particularly like the last bit of advice.