Tarditionally, northern New Englang trolling for landlocks and trout is done after iceout and then again when the weather cools in the fall using intermediate lines when the fish are on the surface and fast sinking lines when they are not
In the summer, you'll need leadcore line to get down to the level where the fish are.
Each area and even the individual lakes have unique streamer patterns depending on the coloration of the local smelt.
There's a lot of tradition to this type of fishing and I'm sure that you'll be able to find plenty of information about it.