Software may look expensive, but if you find out what you really need, as opposed to what you think you need, then you may discover that quality software is often available for free.
Accounting software, for example, needn’t be a complex system you need to buy, install, and then take a course on. Most businesses will run adequately using widely available programs such as Microsoft Excel, which most businesses have installed anyway. Also check the ATO and other government sites for endorsed record-keeping software that you can download for free.