I'm a tech freak :3 ill try to answer ALL your questions. Or say I don't know if I don't.
1. Charging: Should I plug in often, Lithium batteries love full cycles, however tesla uses thousands of small batteries which means it doesn't matter at what percentage you start a charge, what matters is that you charge to 90% everytime (avoid topping unless for trips, avoid charging in multiple small cycles VS one cycle)
Don't worry about hear Tesla has built in cooling system for battery.
2. Insurance: Good insurance companies for better rates? Things to be aware of?
Ask insurance to provide you better rates for a clean car, some insurance companies offer more money if you have autonomy (cruise aid, etc). My favorite is progressive.
3. Air suspension vs regular suspension: Tesla has foam filled wheels to absorb turbulence, you should also go with the smaller 18inch wheels to have more rubber to absorb shock. Air suspension are third party and not covered by warrenty or can void it.too. Use them if you are nice on highway
4. Sound system: I figure that since I will be driving a vehicle with virtually no noise, I will listen to the radio more often. Can guys with the premium upgrade chime in on if it is an impressive improvement over the regular sound options?
The full premium package adds a second amp, a subwoofer, a sit of speakers behind the rear seats, (tons more on premium package features beside sound)
The partial premium still sound great, just don't buy standards... All suck.
5. Service: Nearest Tesla station is over an hour away. I won't need to go probably more than once a year? Do you recommend prepaying for a service plan?
6. Warranty: comes with the car and don't worry, no you won't be coming yearly to tesla dealership (unless inspection maybe) all software issues are solved OTA, most hardware issues (almost never happen) like break pads etc can happen at your house.
7. Tesla App: The app is the crucial part of Tesla you might say without the app you don't really have the tesla experience. Here's a few of things you can do on app, Summon drive the car with your phone, popup trunk, frunk, or lock, flash lights, boop horn, turn on SENTRY MODE, AC control, Phone serves as key to your car, approach car opens, Remote Start car from anywhere in the world, Valet mode, Speed limit mode (If you give it to a teen lol), and much more.
8. Charging Cables: Tesla will come with portable charger which is as good as a Level 2 station (40amps) the wall unit can handle up to 100A which is super awesome. The slower the charge the longer the cycle, the slowest charge damages battery (see trickle charging effects), the lower the charge you arrive with the faster you'll charge (see tapering)
A 110w socket takes a few days to charge
A 40 Amps will take 7 hours
A walk unit can charge up in 3 hours.
A super charger will fill you up in 1 hour (if you were near dead empty)
9. Cold weather package: What is this exactly? Is it necessary for PA winters? I sometimes scrape ice off the INSIDE of my Wrangler windshield, so I'm used to the cold weather with a softop vehicle. (don't know)
10. Vehicle SIM Card: Would the M3 have a SIM card in it so it is always connected? Who pays for this data? Is it built into the price of the car (Yes and Tesla pays) you do have WiFi option which enables video streaming, and good for OTA updates