ecoloco, welcome to the forum and congratulations on your purchase!
ES vs. SE: good question and I'll have to go back to the original brochure to identify all the changes. Here's a quick snapshot:
The ES and SE vehicles are identical in all major features. Significant differences are that the SE has alloy wheels and slightly better upholstery and DRL/Fog light combo and a better sound system. The SE Premium also has a Nav and backup camera display as well as CHAdeMO DCQC standard.
The ES might have CHAdeMO as well - when you get the car see if there's a little lever on the left bottom of the driver's seat, which would open the left rear sidecover. Otherwise, that cover does nothing.
Charging cards vary, dependent on your location (you might update your particulars http://myimiev.com/forum/viewtopic.php?f=13&t=3196
). ChargePoint, Blink, EVgo, are just a few brand names, with ChargePoint quite popular all around the US.
For your commute, the basic Level 1 (120vac) EVSE (Electric Vehicle Supply Equipment) also referred-to as a Charging Station (the charger itself is built into the car) should suffice. You can have the original Mitsubishi EVSE upgraded to be 120vac/240vac compatible with programmable current via http://evseupgrade.com
To find charging stations and information about them use http://www.plugshare.com
and their app. Be sure to review the settings to have them be applicable to your i-MiEV.
All the best, and I'm sure you're looking forward to having the EV grin.
BTW, do you know where your i-MiEV is from, originally?