I don't know too much, but I do know that trolling for walleye can end up giving you pike at the end of the day (if they're in the lake). It's pretty effective but from what I've seen it's difficult to really target one species of fish by trolling. If you want walleye and nothing else (except maybe sauger), I would just sink some leeches or minnow down the deepest holes in a lake at night or jig a plastic worm.
All I know for walleye trolling is river stuff. From what I've seen, a decent johnboat cruising with that perfect velocity that keeps a spinner running smoothly and hardly makes a wake is enough to wake up a predator. But don't zip down too fast because walleye can be spooked easily.
Sorry I can't be of more help. Tell me how it goes.