The transition to driving the A should be relatively easy for you, but there are differences. I looked at several videos on driving A's and also marked reference spots on the windshield to help stay aligned with the road. I left them on, every once in a while they come in handy. Most have a tendency to cheat to the right side of the lane, so watch your mirrors to help keep you centered.
And on the PDI with the dealer, I highly suggest you hire a mobile independent technician to go through the coach before the dealer gets your cash. It will be the best money you spend.
Good luck with the A! We love ours!