As always in these instances, Seatguru is the place to go!
SeatGuru Seat Map Emirates Airlines Airbus A380 (380)
Now, as Emirates have only just started flying the A380, there isn't much information on there yet, however people have started to add data. If in doubt - go for an exit row!
Although each airline has their different requirements for seating, it might be worth looking at what people have written for the Singapore Airlines A380 too:
SeatGuru Seat Map Singapore Airlines Airbus A380-800