Charger, charger , charger. Research, purchase, and installation should be your first priority. Then prowl around here and YouTube learning the ins, outs and quirks of the car.
Make a list of features, settings and capabilities you want your salesmen to review with you during delivery.
If you can't conduct a very thorough pre delivery inspection either have them write something into your contract or delay delivery until you can do so. (It was raining hippos and rhinos when we picked ours up)
Research the finance office add ons in your area before you walk into the dealership. Know what your answer is to every single add on option BEFORE you walk into the building. In our state once you sign, it's yours. There is no cooling off period or right to cancel.
Check EA and other apps to locate appropriate charging locations in your driving areas. If you are close by check them out to ensure they are actually a viable option for you.
If you have a plan to do PPF, ceramic coating, tint, etc research your local shops and get price quotes. The best shops in our area are running several weeks to a month out on appointments.
Practice your polite indifference mode for the EV sceptics in your life. Even random strangers will accost you with EV horror stories.