If you are looking to start with 4 rods, I'd start with 1 dipsy diver rod, and 3 leadcore rods
Coho and summer steelhead are usually a top 30 feet of the water column game - so I'd spool the rods with a 2 color, a 3 color, and a 5 color (you can make that out of 1 spool of 10 color lead)
If you need to get the leadcore rods a bit deeper, you can add snap weights/dive bombs/torpedo weights or something similar
Body baits:
brads thin fish in red/black squiggle, orange/gold
orange J-11 jointed rapalas
Spoons:
Dreamweaver super slims and regular size in Buffalo Bill, Craig's Steelhead, Bumblebee, Mixed Veggie, Starburst, Steely Cane, Riverside, Steely Stomper, Jawbreaker
Michigan Stinger Regular Jordo, Double Orange Crush, Blue Dolphin
Moonshine Agent Orange, Steely Ranger, Craig's Flounder
Using dodgers/rotators with flies is a bit more advanced than spoons/body baits, but can be great
8 inch orange or fire dot dodgers with 2 or 3 inch flies in green, blue, gold, or purple (gotta run slower with these, like 2.1 to 2.4)
8 inch spin doctors (can run faster than dodgers)
My favorite steelhead setups would be a 3 color with a double orange crush, a flatline or 2 color with a red/squiggle thin fish or J-11 jointed rap, and a 5 color with a buffalo bill