Be prepared for anything. There's a reason the NYNJ dive scene has a colorful history and inspires heated debate (re fire vs taj). There are some hard and fast rules, but you'll learn for yourself what works over time. Keep your expectation realistic however. Don't be a Zero to Hero diver (which seems like you're not) but take the concept of progressive penetration and adapt it. For your first dive, take a slow descent, keep your eyes open.
Study the Carolina rig as you're making your way down the line. I've seen many novice divers come back up the line all the way to where the bow is tied in. A Carolina rig separates from the anchor line and runs under the boat to the stern at about 15ft depth. Pay attention to this as you're making your way down initially.
Study the area that you're tied into on the bottom. Either you or buddy need to run a line (keep it tight - lines with excess slack WILL kink and tangle in your reel). If that happens, don't panic - remain calm. Don't fix it underwater. Try not to cross other lines or leave yours suspended high in the water.
If you're on a wreck with decent relief (it rises off the bottom a good bit) if there's current, find the side of the ship opposite the current and stay on that side. If it's really bad, don't stray too far from the anchor, and do whatever you can to get back to the anchor line for ascent. Strong Current plus Free Ascent will ruin your day (and potentially night as well) as you float around the Atlantic waiting for the boat to find you.
Not trying to scare you - but being realistic. This is a really, really incredible region for diving - if you're prepared, knowledgeable and competent. This is a place where complacency has and does kill.
And for everyone's enjoyment, here's a video someone took on a boat in August. Notice the guy in the lower-right hand corner... It was his first NorthEast dive (had only dove in Hawaii) and was not prepared for the weather. Granted, it was raining crabs and lobsters and the waves were big (we had to pull after the first dive cause it was too rough to put more divers in).
https://phillybobspics.shutterfly.com/pictures/1859
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