Hi No Ive never had to use a Plugin to do servicing, although if you are going to keep it for a while, it is recommended that you get a Nanocom or similar.
Based on my relatively short ownership experience, the following may be useful to you.
NOTE These are from practical experience but also my opinion!
Get in the habit of checking oil and water levels every week, as you came from a Defender that probably wont be a new thing! But many owners of new cars never check levels and thats when problems can start.
Sniff your dipstick as well! It should never smell of diesel, if it does you could have injector seal issues.
Also check the level isn't rising!
The D2 should start virtually first turn, in almost any weather, if it doesnt, its a flag that something may need looking at.
It should happily idle and not start to cut out when stuck in traffic (although ideally you shouldnt let any car idle for more than 60 seconds when not moving!)
The gear shift, if its a manual should be nice and light, two fingers should be all you need to change gear, if its baulky it crunches then your clutch may need bleeding (very easy if its done properly!) and/or you may have the wrong oil in your gearbox, wrong oil usually makes gear shifts stiff when its cold.
Dont use supermarket diesel!
Dont use fuel additives
Think about doing a proactive injector seal change, its quite easy to do and will stop issues arising.
When your doing the seals change the injector harness as well, that will also stop potential issues.
Use genuine parts if you can, they may cost a little more, ok bigger items will be a lot more! But many cheaper parts are just no good.
Oh and in case I forgot, check your oil and water levels weekly!!!
My D2 was my first LR experience and although it kicked me in the teeth once (total engine rebuild!), now its back on the road I still love it!
Ive owned over 40 cars and very few have got under my skin like the D2!
Mark