I just got a 2015 Ram 3500 Laramie Crew Cab 4x4 long box with the CTD and it's my first diesel as well. There is a "Diesel Supplement" to the owner's manual that gives you all the details on filters, etc. If it wasn't in the truck you can download it from the Ram site. You're about right on the filters, there are oil life and fuel filter life monitors in the vehicle details display.
FYI, there are 2 fuel filters on these trucks, and the dealer will get about $500 to change both and do an oil change. You can DIY for about 1/2 of that.
One key thing I have learned: There is no fuel cap but apparently there are two flappers in the fuel filler neck...if the diesel nozzle isn't in the filler as far as it will go, fuel with splash out.
Good news is that these years still used the Bosch CP3 injection pump, not the new CP4 which apparently has been problematic for all of the big 3 in diesel trucks.
Good luck and congrats on the new truck!!
