In addition to what I’ve seen others post:
1. Plan for how you’ll charge it at home and understand how much charge speed/amps you really need. The Teslatap charging guide is awesome. It answered 99% of my questions:
Home Charging Wiring Guide – TeslaTap
2. Learn and understand how to calculate your efficiency and range. I.e., wh/mi. This will prevent you as a new owner (assume you’re a first time EV / Tesla owner, btw) to ask questions like ‘why am I not getting the 326 mile range’ type of questions. In short, you need around 245 wh/mi to achieve the EPA range...but know that EPA range is under perfect conditions (50mph, flat road, no headwinds, etc.). My experience (just like my previous ICE cars) is to expect 20% range than EPA in summer and 30% less in winter.
3. Get the Tesla mud flaps and PPF for the rear door. The salt/rocks/etc. the front tires kick up will chip the pain in the lower part of the rear doors.
4. Consider if you want all weather floor mats, trunk and frunk mats. The most popular are 3D Maxpider, Tesmanian, and Tesla OEM (Weathertec). I went with Tesmanian and have been very happy with them.
5. Consider if you want to purchase a center console bin/organizer. The main opening is rather large, it’s just a giant hole. There’s a ton out there for options. I ended up buying one on Amazon (that I stopped using after a couple of months) and replaced with one from Tesmanian (b/c it has a cutout for the light).
6. Understand how the car should be raised on a jack for tire removal, etc. There are specific jack points (it’s in the owners manual). One thing you may want to get are ‘jack pucks’ that plug into the hole of the frame so the jack can press up on the rubber pucks. Super cheap...like $15 on Amazon. You’ll also need this knowledge in case if you bring it to a tire shop that doesn’t know how to jack up a Tesla or the state inspection station.
7. Determine if you’ll need an extra Universal Mobile Connector (car comes with one and some ppl use that as their primary charger at home, I do) to keep in the car at all times...and with the right adapters (5-20, 14-50, etc.). The Teslatap site I linked above explains all of the adapter types.
That’s about it off the top of my head. Hope this helps!