You may be getting a Generation 2 Goose Box, so this may vary. Gen. 1 has colored tape on the side. Inflate the air bag until you see the green tape. I believe Gen 2 has a hole on the side and you air up until you see the correct level in the hole. Put a shot of grease in the zerk at the hitch point. When hitched just make sure the hitch release is back in the locked position. Locked and Unlocked are written in large letters and easy to see.
As far as set up, make sure when you back up the trailer misses the cab and the hitch misses the side rails of the truck when turned. When the hitch is aired up, you should have at a minimum 6 to 7 inches of space between the truck rails and the camper.
Most states require chains for a goose neck, so make sure they installed chains and you have points on the truck to anchor them to.
Read these install instructions to double check what the dealer did:
Then, just enjoy the ride.