I’m new to squid fishing myself and have learned this is what squid looks like on sonar. A big school shows up as horizontal stripes near the bottom, this is a bad picture but you get the idea.
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I use 3 jigs with he heaviest on the bottom, about a foot of 40lb mono in between them and half ounce sinker below the bottom jig.
You drop it to the bottom, give it a couple cranks up and start jigging. When squid hit there is a slight tug or heaviness to it, reel it up and let it squirt out all its water and ink before you drop it in the bucket.
Where do you guys get the mesh basket from? I’m using just a small ace hardware bucket.
Unlike with fishing, with squid you do want to group up with the crowd

and when it slows you can spread out to find that next school.