Use your paper charts or Navionics web app and look for rock reefs with structure in the 40ft to 120+ft depth. Best structure I find has drop offs of 10-20 feet. Start shallow so you slowly drift deeper. Drop your jig or bait rig to the bottom crank up a couple of turns and jig, or drift your bait. When jigging, every 3-5 jigs I free spool back to the bottom. Key with lings is dropping it over those ledges. I find I get them when dropping from 40-60, 60-80, 80-100 etc. Jigging down the structure means fewer snags and you take advantage of the lings tendency to lurk at the edge or bottom of those drops looking to ambush prey. I don't find you need fancy gear - 8oz lead head and big power bait white grub or 6-8 oz banana weight to a short mono leader with a big hootchie and some bait - large herring, Octo, squid, mackerel, etc.
I run power pro main line as its thin diameter and low stretch make it easier to stay on the bottom and you don' those jigging action to mono stretch. Always a mono leader of 40-50 so it breaks not your main line. lead jig heads and grubs are relatively cheap and if you're not losing the odd one, you're not fishing the right areas or effectively. My set up is a 6ft trevala jigging rod with Avet SX loaded with 65lb power pro. Fast action to transfer jigging action and light enough to jig for a while. Love the Avet! Also have two lighter set ups when shallower - an Okuma Nomad travel rod with the fast tip on and a Daiwa Luna level wind - love the luna for salt and fresh. Also have a spinning set up for those who come on my boat who can't use a lever drag or level wind. Ugly stick with a Penn Spinfisher V.
Can't wait to get some fresh ling myself - beats halibut in my book!
Cheers!
Ukee