If you have a decent car then Lyft and Uber on the side for living expenses and operating cost of the car so your $90k is only used for flight training and not anything else.
Put it in some sort of account that gives some interest.
DO NOT buy a plane.
It may seem a sensible idea but it rarely is unless you’ve grown up in aviation and you know what you’re looking for and you can find a great deal.
Get some glass experience but do it after your CPL or do your CFI in a G1000 airplane.
You want the dual experience for sure.