Check into all of your potential rebates. You know there are rebates, correct? The government (in certain states) has a bunch of ways that they'll reward you for taking the solar energy plunge. And there are also benefits during tax season. Look into them all so you'll get every penny coming back to you.
Carefully consider the types of solar panels you plan on having installed. Long ago, if you didn't have enough roof space, you'd need very expensive high efficiency mono-crystalline panels. There are now more advanced polycrystalline panels and even thin film panels. If you've got enough roof space, you might wish to look at the size of the panels in relation to their output capacity to avoid having insufficient panels that you need more of later.
Following on from our ‘how it works’ presentation; this 7 minute video shows the economics of a 3kW solar + 7kWh Tesla battery in Australia.
Purchase batteries to store excess solar energy. These batteries are similar to rechargeable batteries; however, they use the sun's energy to power up the batteries. This energy can be used in the evenings and at night to help power your appliances, televisions and lighting requirements. These batteries are relatively inexpensive making them a great choice for the beginner.