Far from a sharpie, but thanks for the kind words.
For ling and tog you want the bait on the bottom. There are some times and places where you'd adjust the height/length of leader, but go with the default of it being on the bottom.
I tie the snafu rigs for blackfish using 60# and up stiff leader. Don't feel they're line shy at all. The rig I posted my lame pic of is just a standard bottom-fishing rig. I use that style for flounder, ling, whatever.
Basically just a hook sneeled to a leader with a loop at the end to attach to a 3way swivel or dropper loop. Will generally use atleast 30# test for ling/tog. Personally think fluro is a waste and you want to use mono that isn't to "soft" so it won't twist or get kinked easily. When finished with the snell and loop at the end, the leadered hook should be around 10-16" long.
A hi-lo rig will work and you can just add a second hook by making a dropper loop in the bottom leadered hook. That's what the pic shows. Basically a quick way to make a two hook rig.
You can fish two seperate baits or a whole crab with a hook in each side...not a true snafu but it works. I wouldn't worry about using a snafu fig unless you're dedicated to just fish for tog. On an "open" bottom-fishing trip, you sometimes want to maximize your efforts so fishing a clam and a crab bait might be wise.
Ling will readily eat a clam bait, but also will swallow a cut green crab. If everyone is catching ling and no tog, then stick with clams. If tog are coming up, then go to green crabs. If it's a real sticky piece and snags are happening, I'd definetely stick with just green crabs...unless you like Silver Eels and/or Pout, then fish with clams
Ling are fairly dumb, if they're around they'll eat your bait. Blackfish are a little more tricky and generally don't like a moving/bouncing bait.
Tough to point you in the right direction and explain rigs and such online. The boat should have rigs similar to the one I showed. Putting a single leadered hook on a dropper maybe a foot above the bottom rig can help you catch a cod or other fish as well. Can also use the hi-lo rig for that purpose.
For Mackeral, I'd just let the mate rig me up. Maybe bring some jigs to use as the weight...have heard some bass are still around feeding on them so you never know.