Every icefisherman will probably give you different advice.
As for holes if the holes you are fishing are not producing try some more a little deeper or shallower. If you can find some green weeds

.
For bait in Canada minnows seem to be the most popular. Small jigs tipped with maggots or mealworms will also produce.
The small spring type strike indicators that fit on the tip of your rod help when the perch are biting lightly.
Fishfinders will tell you if & when fish are in the area. They will also tell you if the fish are near the bottom or suspended.
Good Luck