Good warm water proof bibs and coat.
A couple inexpensive combos to start with.
A portable fish house.
Buddy heater.
Small tackle box.
Jigging spoons and some small jigs.
Ice scoop.
Spud bar and safety picks for early/late ice.
Warm boots and clothes are #1, if you don’t stay warm you won’t stay fishing. Auger, basic electronics like a Vexilar FL8 and Navionics app on your phone for mapping. Hub fish houses are easy and cheap, and a buddy heater. One good tip up and a couple rods. Scoop, weight puck, jigs/hooks, and a scoop of fatheads and you can be fishing effectively for under $1k. If you shop around for used stuff, it can be quite a bit less.