I left 11 years ago, so check regs a little bit. Better yet, hire a guide for the first day and just listen to them.
Gamakatsu makes a specific hook for the Russian/Upper Kenai- they are the ones to get. Very specific about how big a hook you can use.
As for fly selection- a lot of locals bring a bag of hooks and a spool of red yarn. Tie on hook, then tie a 3" piece of red yarn. A fly is born. That is how important fly selection is, as they are not eating in fresh water and don't really eat many fish in the ocean.
Hook can not be weighted, but you can use tire weights or bowling balls on your leader.
We usually had a 10' section of stout maxima with a good bit of big split shot 2' above the fly. Like was mentioned earlier, you are just flossing them, and when done right results in lots of fish hooked in the mouth. If you snag one, you have to throw them back and fish cops love writing tickets on snaggers.
It is definitely not regular fly fishing. And generally you are fishing near other folks, and they will appreciate it if you use stout enough gear to horse your fish in fast and not start a rodeo. The first run fish only weight about 6 pounds, but they are strong, and if you snag one in the back or side it is not easy to reel them in.
I miss that fishing. It was weird, but really fun, and June and July in AK are awesome. Have fun.