Hi everybody... new kid in town here..

I am a newbie when it comes to solar energy but have always been fascinated with it. I am not very good at the technical side of things so I hope people here can help me understand how a Solar PV system in your house will produce more energy than your demand and thus you can sell to the grid.. I have read in some books that Solar is very expensive so how does one recover his investment?

Welcome to the forum.
Please look at this thread to tell you how grid connected systems work.
A typical 1kw system will cost around $3000USD and it will take around 10 - 15 years to pay itself off. So, you will not only have cheaper electricity in the future, but also the electricity youve been using for that time does not harm the environment.