Looking for an efficient Virtual Investment Platform

I am a new entrant in share trading and investment business. Although I am very enthusiastic about the whole thing, still I am a little worried of the risks involved. Due to this, I believe that I will not be confident enough to trade at this point.

I believe that I need a good understanding of the market and some kind of rehearsal trading, with some kind of fantasy money. Therefore, I request for your useful advice and suggestions to help me out get through this with ease.