I'm a Q pilot but I know E175 folks get the same packet.

My advice for a Portland to Seattle commute would be to get parking up at KSEA and drive yourself up. In the long run it's going to save you time, although it will cost you some extra money putting the mileage on your vehicle.

Don't put any stock in current times on reserve/holding lines. It's going to change and there's no way to predict what you will experience. Plan for the worst hope for the best.

Training pay (which is through the end of the month that you complete IOE) is 16 hours per week. Per diem for the time you spend away from base, which for training should be Portland until you get to OE.

After training it will be min guarantee and whatever extra you manage to make for the month (extra flying, per diem, etc.) A super rough estimate is $35,000 or so first year. After taxes and my deductions I take home ~$1800 a month.

If you can swing it you'll have much more free time living in Seattle doing reserve from home. But it's expensive up here and a different pace than down in Portland. Certainly not for everybody and unless you have a second source of income I can't recommend it.