You'll find perch anywhere you'd find bass or crappie. They love to hide in and around submerged weeds, hiding from bass and pike. Best bet is find a weed edge or drop-off and set up right over it. Use a fish finder to see where the schools are. I use small grub jigs (fluor. green of white and black jig head). The smaller the better, on an ultralight rod with 2-4 pound mono. Perch are not picky and will beat each other up to take your jig. I always carry an ultralight rigged for perch/crappie when bass fishing. Just in case the bass are turned off, switch to perch. If the perch bite is off, go to the bar.
Best perch/crappie fishing would be right now, through the ice if you can find some that's safe. Back in NH we'd get yellows in the 1-2 pound range early winter, and whites in the 2-3 late winter/early spring. God, I miss ice fishing.
Tight lines, and good luck.