MH, Spearing is legal here in MN too.
I grew up doing it, Northern Pike are the only legal game fish that can be speared through the ice in MN.
First of all you need a REALLY dark house. No windows or covered real well. banked good on the outside with snow. You don't want a bit of light to cause some sort of reflection.
You need a good size hole 30 inches sq or similar.
Water depth should be best at 6-8 feet.
Weedy areas (for Northerns) is best.
Decoy suspended 3-4 feet down from the top of the ice or 16 inches or so below the bottom of deep ice.
Live decoys are best, sucker minnows 1 foot long or so with a harness. Keep a lively one on.
Northerns sometimes come in a hundred miles an hour!

Sometimes come in very slow and stare at the sucker. Either way a guy good with the spear gets the fish.

Everybody here has a collection of artificial decoys too. Most any will work some and some more then others.
My favorite is a white decoy with a red head about 8 inches long.
Put the decoy on a breaded line 20 pound test or so and always use a good swivel.
Your spear should be well balanced and sharp, 7 tines are nice. All steel with about a 4 ft handle. A good flexible nylon rope 1/8-3/16 attached.
When the fish comes in just put the tines carefully just below the water surface, take aim and let er go, release the spear entirely letting the spear and fish go to the bottom. Retrieve carefully. ( I've also one handed a few in my day)

Attach the other end of the rope with plenty of slack to your wrist or a handy eye hook on the wall.
Great Sport for sure!! :cheers: