Do your own research and find out if there are any rebates available for adding a solar system to your home. There are many local, state and federal programs that offer rebates for installing solar power in your home. Also check to see if you are eligible for tax incentives as well.
A video presentation on Solar Energy, strictly on Photovoltaics (PV). These presentation is specifically based on a college project for an Engineering course.
Get the records from your energy company on how much energy you have used in the last five years. You can then use this information to figure out exactly how much power you will need solar energy to provide for you home. Having the past five years is important so that you can see that some years you will need more energy than others.