Always use non abrasive cleansers on your solar panels. An abrasive cleaner can scratch the surface of the panel and cause permanent damage and affect how well the solar panel works. There are commercial cleaning solutions to use or you can use a pool skimmer with a very soft cloth on it.
Your solar panels should be able to get a maximum amount of light form the sun. If you are set against hiring a professional to assist you, you can start tracking the sun's movements yourself to calculate the best positioning.
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It is a good idea to tie your solar panels system back into the grid. With this type of system, you can sell excess energy to your power company. This will help pay for the installation of your system and even allow you to make a profit on your wise investment.