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.
Make sure to watch the light on your solar panel inverter regularly. Check it at least a couple of times a week, while sunlight is hitting your panels. The light should be green. If it is not, your panels might not be working correctly, and it is time to call in a technician.