I do not recommend resigning from your current job, until you have been consistently earning 3 X+ your monthly wages each month for the previous 12 months.
Every person 18+ can be self employed, either partly or fully.
As an Individual/Sole Trader, using your Full Name as your Business Name.
Having an ABN is beneficial, Tax Benefits: Most expenses related to the business, can be claimed as a deduction:
Part Vehicle Running Costs.
Part Utility Bills.
Part House Cleaning.
Stationery, Technology Expenses.
I recommend checking out the ATO link below.
Many Businesses have discounts to ABN holders.
Please obtain Financial Advice before deciding and conduct research too, includes speaking with the Owner of the business you plan to invest with.
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This is a recent video I made.
Every winner can be a business.
If you live in Australia, I highly recommend checking out this informative ATO link