Your heading in the right direction. Bobber and a jig is an effective way of fishing, also drifting yarnies or corkies, as well as spinner fishing. Type each of these ways in google and you will find numerous ways of fishing them.
As far as where to go... almost any coastal river will have a winter steelhead run, as far as certain spots... you really just need to get out there and explore each river to find one that fits you, check the regulation book for any deadlines these rivers will have. As far as it being to low of water each river takes a different amount of rain to make it fishable. Idealy you want a light green water color, "steelhead green". And most rivers in Oregon only allow you to keep hatchery steelhead, so check the regs for that too. Steelhead fishing can be very frustrating, have patience and it will be worth it. One of a kind catch!
Good luck!