Welcome! I highly recommend the above books mentioned by troutdude, "Fishing In Oregon" is my bible, I use it as a base resource for the vast majority of my fishing excursions.
Seeing as you're based in Beaverton going coastal would be a good bet for consistent fishing. The Wilson is a fabulous trout stream with many opportunities for bank angling(just look for the many pullouts along the road) which depending on the season offers opportunities for the larger targets of Salmon and Steelhead. Right next to the Wilson is the Trask another good trout fishing river which sees lighter pressure. You could also take hwy 26 instead of 6 and fish the Necanicum another small coastal river with some decent fishing. All the rivers above host respectable Sea Run Cutthroat runs with the Wilson being the most noted(hint hint they're there now!)
Personally if I'm targeting larger trout I use my 9ft 5wt(I cast better with it) but I always bring my 7.5ft 3wt for when I want to really watch my rod bend. Fly selections should be about the same, a variety of caddis patterns, some small stones, duns, midges, and mays. If you're nymphing don't leave home without a bead head pheasant tail. Small streamers for SRC work very well with patterns with yellow or red producing effectively. The only other advice I can OFFer is that this time of year the rivers are running LOW so you'll have to work a bit more to find those shaded banks, and deeper runs where the fish are holding.
Best of luck.
P.S I'm always down to fish if I'm not working!