Replace the washer fluid container, that should fix your leak. While it is out check for any damage the leaking fluid may have done. Make sure your battery is in near new condition. The batteries getting a bit weak wreek havoc on the LR3s. Replace with the Land Rover-recommended Interstate battery.
As far as the door dings, purchase a set of door mouldings
. They install with double back 3M tape. It'll take you about 5 minutes to install.
I've owned an LR3, a Range Rover Classic, and a Discovery and had zero problems with any of them. I hate that you're already having issues with your new vehicle.