e-r-a-n:
I will order the relay & Uno rev.3 starter kit.
Can you tell me please which wifi shield will be the easiest to configure and work with?
as i dont know the parts very well, having even a link or specific model will be very helpful
Never used one, but you can always Google something like "arduino Wifi control led" and find projects where people have done similar things to what you are doing and just look at which shield they are using.