I use a multi-tip system (like Rio versa tip). One of my most commonly used tips is a Rio type 6 150 grain (10 wt) tip. I also use the type 6 109 (8 wt) tip but this sinks slower than the 150 grain tip, even though they're both type 6 lines. You'll need a rod with decent backbone to toss this - an 8 wt rod should do fine. The tips recommended by young gun are a good to have with you as well. The tip of choice will depend on the water conditions.
As for leader, I often use 8 lb maxima ultragreen and may go to 6 lb when the water clears and the fish get spooky. I also like to use flurocarbon leaders when the coho get extra spooky. You can go heavier when the water colours - I often use 12 lb maxima ultragreen in the Squish for chums. As for flies, GP variations, leech/bugger patterns, streamers (coho blue, mickey finn, x-mas trees), and rolled muddlers are standard.