Read the manual first, then go through the settings in the car and the options will make sense to you.
Some of the first few accessories I got include thin plastic trays that slide in between the seat and center console to both give you more storage space for trinkets as well as stop you from dropping stuff into that gap, bag hooks that hang off the back of your head rests, wireless carplay dongle, and then I fog bombed it to get previous owner smell out of the car and ventilated seats.
Then I kind of went nuts with a car wash setup (pressure washer, foam cannon, soaps and chemicals, etc) but I have 3 cars that it'll be used for.
