2d depthfinder is just fine. My favorite depthfinder ever is a lowrance x16 paper graph. I have 2 elite 7 ti touchscreens now and I am still learning them. Much of what I fish I found using the paper graph about 25 years ago. I still spend a lot of time looking at depthfinder.
For me, the best schools will be on a flat and there really isn't any structure they are relating to. I have always and still anchor about a half a cast on top of a dropoff and throw into the channel and bring a texas rigged worm back up the drop off. Many fish, and sometimes schools, will hold on the side of the dropoff right next to it.
When fishing a hump or flat, just make sure that you get the lure to the bottom. When using a crankbait, that means a thin line (I like 16 lb magnathin) and long cast. I throw the DT rapalas, poes 300 and 400 and bomber fat free shads a lot. I also throw a texas rigged worm to, a lot. Big spinnerbaits on occasion and starting to use swimbaits.
To me, the most important thing though, is a good anchor, I carry one that weighs 50 lbs. You want to anchor and very often these fish will be schooled up tight. I would go fish without a depthfinder before I would go without an anchor.
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