Make sure you've had the recall/reflash done to the TCM if your cars applies...
Other than that just drive it. There' isn't a service interval to change the fluid even, just to inspect.....make sure you don't use anything to wipe the dipstick that can leave lint on the stick. In fact, unless there is a leak don't bother checking it.
I've replaced one transmission due to a rattling chain before, other than that even the rental cars at are bagged hard every day seem to stand up...
1999 Suzuki Grand Vitara JLX
2004 Acura TSX
1985 Mazda RX-7