Here is a link that will put in the right direction.
washington fishing prospects
Select your county or a close one and it will give you SOME information on where to find crappie, gills, perch, trout, bass and most other species. That is if they are listed. Also, find the number to your local WDFW office and ask them. They are actually pretty well informed in my region and know a lot about where to fish for what.

As far as finding the good spots, talk to your local sporting goods store. There are a ton of lakes, channels and ponds all over this state that have crappie and other panfish in them that are rarely listed as having them. Also, if you see a pond,lake, channel etc, find the name of it and fish it if it is open. I have found numerous small pond that have 1000's of small perch, crappie and gills in them because no one fishes them. And one the largest bass I have ever seen caught locally was out of a 4 acre farm pond.

As for fishing for them this time of year, slow and small or use bait. Find deep structure around the middle of the lakes and on drop offs. Fishing for them this time of year is a lot of work on this side of the mountains. Sometimes you can find them in shallower water especially on sunny days as they chase whatever forage fish are still working the area. Night crawlers, crappie nibbles and the usual will work if you can find them and get them to bite.