One of the very useful tools I found to determine what to expect from solar arrays was PVWatts.
The PV Watts calculator asks for a weather station near your location, then looks at panel size and panel efficiency to determine what you should achieve from your panels. In my case that was something just over 12KW hours per year.
Another tool lets you draw your system on your roof, using google satellite. This allows you to measure the area of your roof and obtain an estimate of the system size/output.
There are other tools on the net too, that help you measure your roof size for panels.
I found my most accurate measure was to measure off the side of the house and then use some math to determine the area in which I had to place panels. If you're more daring than I am, you can also measure the roof :)
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