Another useful guide might be Selected Climbs In The Cascades by Jim Nelson and Peter Potterfield. $1.54 used on Amazon: https://www.amazon.com/Selected-Climbs-Cascades-Jim-Nelson/dp/0898863686
CAG has everything under the sun, Selected Climbs is more of a greatest hits compilation. It also has a lot more route detail than CAG so you have more of the info you need for success.
If you don't know crevasse rescue already, take a course and do some volcano climbing here. The volcanos aren't necessarily the most interesting routes here but they are one of the best places in the lower 48 to do glacier stuff.