Re: NH Seacoast
Well I am pretty new myself, but this is what I've been using. Note: I have been out there for ~10 hours and have only landed 1 striper, but thats good enough for me!
I use a fish finding rig, which is a slip-sinker attached to your line down near the hook. This keeps your bait near the bottom while still allowing you to give slack as needed. Use a 3 or 4 ounce sinker, depending on the currents. I have been using both Herring and Squid. I have gotten a lot of pulls with the herring (Pulled up a few crabs and even a 3.5 foot eel) but not much with the squid.
The best time to go that I have found is fishing the incoming/outgoing tide. I have had the best luck about an hour after high or low tide.
The bridge is a good time, minimal preparation and you get some good bites. I don't have a boat so that is what I have been doing whenever I feel like trying to land one.
Parking is easy as well, on the west side of the bridge.
Best of luck!