Re: Need Some Help- Cutthroat
Seth, welcome to the board, and congrats on the internship-- what a great opportunity. You should have an absolute blast!
Where will you be working, Yellowstone? (to some extent, knowing this might help with fly selection)
As others have said, a nine foot long 5 weight would be ideal for trout and panfish. A six weight might be a bit better if you throw bass into the mix as well, to help throw the poppers and and larger, more wind resistant fly patterns that they smack. So either way, a 5 or 6 weight would be ideal.
Since you might be a bit new to this, a "5 weight" or "6 weight" refers to the line weight that the rod is designed to cast.
Cutts are known for being too picky-- one of the reasons you're probably studying them since they are often more easily caught than bows and browns, so their populations can get a bit hammered in some places by angling pressure and competition from nonnative species.
You've got a bunch of good suggestions for flies and gear. In general, you can find decent quality packaged outfits for 100-150ish including rod reel and line, or better gear by mixing different brands of rod reel and line for 250-300ish and of course up from there.
Keep asking questions, I'm sure you'll get a lot of advice from the board.