Treat automatic gently

Good evening I also have a question. I also drive an “Ami”, well it is only eun V6 in particular a Chrysler 300M, but I like it because it was not exactly cheap, and I intend to drive it for a while, I don’t want to torture it. To burden the engine only when it is warm is clear, but… I haven’t driven so often automatic, for example when you stand at a red light to switch to N and shortly before go back to D. At the switch have i ch, when I have rolled to a red traffic light also sometimes uncoupled and let the car roll, how do I behave with an automatic ? Allgeimein, with low-touring driving mode, at 80 km/h the engine turns in 4 gear (car stick) almost 1500 tours, should one prefer high-touring driving, some thought that the car must often be “free driving” ? Otherwise remains to say, great forum with very interesting threads. A nice WE K.