100,000 MYR = 31,595 AUD
You can last about 2 years 3 months in Australia assuming no additional income


------------------- Usage is 1,149 AUD / month
Rental = 500 AUD / month

Food = 349 AUD / month
Breakfast = 3 AUD / day = 39 AUD / month
Lunch = 5 AUD / day = 155 AUD / month
Dinner = 5 AUD / day = 155 AUD / month

Transport = 100 AUD / month (Stay at home most of the time)

Entertainment = 100 AUD / month

Utility Bills = 100 AUD / month

I have no idea whether it's possible that the employer would want to hire someone with tourist visa, but be prepare for low salary and you have 3 mouth to feed.
You have a big responsibility and the budget computation depends on your family needs too. I've no idea how old is your kids, but you would need to spend more if ya kids is above 6 years old as to attend nursery or primary school.

It's best for you do a research in applying PR to Aus as to get better opportunity compare to tourist visa. Unless you intend to bring ya family for a long vacation at Aus.

Nowadays, I see more friends whom has migrated to oversea and all are enjoying their life over there and earning stronger currency $$$.
Some with reason of stronger currency, better education for children, better pay, etc.

Maybe you can share with us the reason you want to migrate to Aus? Is it better education for your children?
When friends share their comparison on children education, I'm kinda
Imagine children at age 13 years old know how to use MS PowerPoint to do presentation