Here in Penang we had a similar debate after a visiting pair from the UK tried telling us that dummy SHOULD place the led suit on the left hand side as viewed by dummy. This was quickly dispelled, Reg is correct apart from the trump suit, the other suits can be placed in any order.
As for the led card, we have our scoring units set up so that the screen blanks out after 10 seconds. If it is a concern to you, you could do the same.