Firstly, I've got to agree with the previous posts. I used to deliver cars for a living. While most of these were used vehicles, I occasionally got to drive some brand new cars and there were never any 'running in' rules.
Secondly, you ask for tip and ideas. My former job could mean that I was driving an old Jaguar first thing in the morning, a brand new BMW truck at lunchtime and an automatic Nissan Micra at teatime. One of the things I learnt about getting into an unfamiliar vehicle was that it was worth spending several minutes checking out where all of the controls were before setting off. Yes, I know that might sound rather obvious, but suddenly realising that you need your headlights and wipers on can be rather worrying if you're doing 70mph, on a busy motorway, and you haven't got the foggiest idea where the controls are!
So, please, spend some time checking through the controls before you set off. If, like me, you like to have the radio on when you're driving, I recommend spending time programming your favourite stations in. Also, check that you know how to control the volume. (I once got stuck, in heavy rain and equally heavy traffic, on the M25 when I wanted to turn the radio down to allow me to concentrate. The controls were on steering wheel stalks. I managed to turn the volume to maximum but I couldn't find out how to turn it down or off! I know it sounds daft but it's the sort of mistake it's easy to make on an unfamiliar vehicle). Also, make sure that you know how the heating controls work. You don't want to be fiddling with the controls, trying to stop a blast of icey air, when you're doing 70mph!
If any of that sounds patronising, please accept my apologies. My only excuse is that I often learnt the hard way!
Chris