I'm a fan of 1 piece plug rods. If you go that route, 7'9" - 8'2" will be the lengths usually offered. There are very good 2 piece plug rods too. I'm not well-versed on those so others can chime in w/ better recommendations.

Line rating…..The one I use for steelhead and silvers is rated 8-15lb but there are times when I wish it was a 10-20 for silvers.

Actions on plug rods tend to be pretty stout in the lower 1/2 to 2/3 with a very soft tip. Obviously, a heavier line rating will have more backbone while retaining that soft tip action.

Glass-vs-graphite? This one's always a great debate and one that will generate a dozen different responses. The old-school crowd will tell you to look for an original Lamiglas S-Glass or Fenwick fiberglass, long since out of production……too bad. They were great rods. Some guys who fished those old school fiberglass rods will say they hate graphite because it's too rigid and snappy when a fish strikes. Instead of the rod being allowed to bend and load as with fiberglass, graphite is much more "reactive" and wants to snap back thus resulting in more missed fish. That said, you'll find a majority of people using graphite today. It is lighter. more responsive and some will argue that you will get a better dance out of the plug. It truly comes down to personal preference.

My 2cents