Mack's got the location and behavior down perfectly, but this is where I disagree a bit. I like plastics like shrimpos for trout a lot too, tipped with usually a waxy. If the trout in your lake are big, a 4" live shiner or sucker under a tip up should produce some biggins. Worms, like mack said, also work well, even plain. Rainbow trout are definitely the easiest fish to catch under the ice for sure. Lots of times in the early morning (right around dawn especially) they like to suspend right under the ice in about 2-6 ft. of water. (still fish the same areas)
Overall, soft plastic small jigs like shrimpos are my favorite for trout though.
Remember with rainbows that a sonar can be handy because they suspend more than almost any fish under the ice, the only exception being crappie and bluegills.
There really is no way to "bring them in" with huge effectiveness, the best way is to go to them. Once you find a really good spot, you can usually stay in that general (40 sq. ft area) for a few hours and still be catching a bunch of fish. You can bring them in to a known spot for example by throwing down cans of catfood (with holes in the top) the night before fishing.
I don't suggest chumming for them because it is known to kill trout if they gorge on it, which the often will do. Contrary to a few members' belief, that is true according to cdow biologists and from what I have seen.