You'll get F lounge access. Lounge in Dubai is very nice so get there early to enjoy a nice restaurant style meal. You're also entitled to a complimentary massage (15-20 mins) or they will give you a discount off a longer treatment.
As for seats, bag a window seat. If its a 777 I would say any window seat is fine.
Your chauffeur pick up in DXB if you need one will be a Merc rather than the Volvo.