There are a lot of different options/paths to teach you how to crack climb in the NW. The good news is that Oregon has some top-notch crack climbing crags that together make an excellent progression.
Honestly, go to the columns in Eugene. It's literally the best place imaginable to learn to jam/lead. Easy to hang TRs, smooth rock=minimal gobies, many easy, slabby cracks to figure out your jams. To progress quickly, try to avoid using faceholds. (this is good early on, but should be used solely as a training tool to avoid transferring it to normal climbing-think of it as training wheels) Routes to focus on: Fat Crack, Hard Lie Back, Limp Dick, and Satisfaction.
Once you're bored of the columns, go to Smith and get down to the basalt. The Lower Gorge is a great place to break into leading 5.10. Good gear, awesome routes, nice, soft grades. Routes: Bloodclot, Badfinger, Cruel Sister, Quasar, Gruff, Morningstar, and the 10c finger crack that I can't remember the name of
The end of the treadmill is Trout Creek. Head to Trout once you think you're solid on .10 in the Gorge. You'll probably get paddled (I sure did) your first time, but if you stick with it, Trout will prepare you to climb long, sustained splitters (especially stemming) like nowhere else. The creek will feel soft when you go. (because it kind of is) Routes: Gold Rush, JR Token, Mr. Squiggles, Wondertwins, Two Step Left and Right, Lively Up Yourself, Sleepy Hallow, Bushwhacker, U1-3, (watch out for U1) Landing a Monster, and Suzuki.
If you make it this far, your love of crack climbing might have mutated somewhere along the road into a fondness for traditionally protected adventure climbing. If this happens, check out Moolack and Index. Both are comparable crack climbing areas that offer steep, sustained climbing with a very different, more technical style of movement than you typically find on basalt.