Find a Business mentor & accountant who's been there and done it in the same industry. Focus on the main one thing, looking after your lifestyle.
Remember tgat cash is king so hold enough working capital to run the business for 3 months.
Some costs are consistent taxes, competition, administration identify how much you'll expect to pay for this by looking over the last 2 years wages & gst statements.
Smooth out the bumps by having invoices coming in at different times during the year or month.
Record how customers are coming to you.
A double cab ute pays no fringe benefit tax, because it's classed as a vehicle primarily for the carriage people not goods.
Perceptive Graphic Designer thinking out of the box for discerning clients.